Full time: That's it, Great Britain have beaten Brazil in front of 70000 people at Wembley and will play Canada in the quarterfinals on Friday! Perhaps a bigger result, though, is that a huge home crowd - live and on TV, the net - has seen such a strong performance from their players. This is a sport that's been trying to win over supporters for years and now they have a huge moment. They are the only side still to concede a goal in this tournament. There are a few damp eyes in the stands. What a night they've had.
90 +1 min: The board says two minutes of added time. GB have a corner... they seem caught between trying to score and simply keeping the ball, and in the end do neither.
90 min: Britain may get caught on the counter in these late stages - they're still pushing up as if chasing an equaliser in the final, with plenty of players in the box as Yankey sends a free-kick in from the right. Bardsley has an easy save to make after Rosana weaved her way through the British lines, though.
88 min: A crucial interception by Andreia, racing out to the edge of her area as the Brazilian defence struggles to cope with the muscle and hustle of White.
87 min: Ouch, Williams's first contribution is a crunching tackle on Rosana. She was chasing a poor touch on a first-time ball from Asante as the British players had their supporters shrieking again.
84 min: Substitutions for Britain: Ellen White and Fara Williams replace Smith and Carney, who both look tired as they get off the pitch. Both have been influential this evening.
83 min: Another hold-your-breath spell from Britain as Houghton steals forward down the left and finds Yankey, who taps it down to Alex Scott. She's hounded out of the shot though and Asante finds hers blocked almost before it's off her boot.
81 min: This really has been a hugely impressive performance by Britain. You can see how much the players are enjoying themselves - the front players have licence to keep pushing, despite having a lead to protect - and Asante and Scott are staying diligent. Marta is forced to shoot quickly from outside of the box, and toe-pokes it wide.
78 min: Andreia has made more punches than David Haye tonight, this time clearing Yankey's free-kick as it drops towards her back post.
77 min: They've just announced the attendance at Wembley: 70,584. That's a new (post-war) British record for a women's football match.
74 min: Carney wins a free-kick as Cristiane tires of being outfoxed and sticks a leg out, and it's Carney herself who swings it in from the left. Stoney is all alone at the far post but doesn't seem to realise the time she has and almost just allows the ball to bounce off the top of her head. It comes down on the top of the net.
72 min: Substitution for Brazil: Grazielle replaces Ester.
71 min: A much better shot from Little this time, forcing Andreia in to a save down to her right. It tells you a lot about Britain's night that her first thought is to shoot whenever she's within about 25 yards.
70 min: If this was any other sport, Houghton would be in line for a damehood. She's just slid in and made a perfectly timed tackle on Daiane, two yards from the byline just to the right of Bardsley's goal.
68 min: Britain fancy there's another goal for them here; Little punts the ball down the right for Smith to chase, and she manages to get ahead of Aline just in time to be shoved over. Aline is booked, and Yankey has a free-kick to put in... she nudges it over to Little, who dances around one defender and then opts to shoot from distance, missing by more than a few yards. Perhaps not.
66 min: More nice football from Britain, Little starting things off with another ducking and diving move and Carney practicing her stepovers in front of the Brazil defence. The final ball - a backheel from Alex Scott - is wayward, though, and Brazil break. For a second no one in the stands dares breath as they compare the numbers for each side, but Brazil are halted not far over the halfway line.
63 min: Aluko is the player to make way for Yankey; not a surprising move given how little Aluko has been in the game. It looks as though Carney is moving over to the right, with Yankey on the left.
61 min: A fine save by Bardsley, thrusting the underside of her boot at Marta's shot from a tight angle on the right after she'd beaten Alex Scott in a chase to the byline. When the ball comes back in from the same side, she's alert to it and makes a comfortable catch. Powell is readying Rachel Yankey.
59 min: The saved penalty should give Brazil a bit of a boost, but they're still struggling at the moment to break through GB's lines. When Britain don't have the ball, they're pressing high and early.
56 min: Smith's shot is saved!
Smith goes for placement, curling it to the keeper's left, but it's not close enough to the corner and Andreia, who guessed the right way, drops to gather it. Smith puts her face in to her palms.
55 min: PENALTY TO GB! FRANCIELLE TRIPS ALUKO!
Britain are shimmying all around the Brazilian defence, and when Aluko breaks through the middle, Francielle has no option but to put a foot out. She is booked and Britain have a spot-kick.
54 min: It's just like watching Brazil! Alright, the move ends with Little's centre bobbling to a defender unchallenged, but that build up was worthy of a YouTube slow-mo with your finest urban soundtrack.
52 min: A roar as Scott steps in and dispossesses Cristiane on the edge of the British penalty area, and GB again make off in the direction of Andreia's net - only a rudimentary tackle at the halfway line by Daiane halts their progress.
50 min: No surprise to see a bit more harry and urgency in Brazil's game at the start of the second half, but Britain coping so far - Bardsley makes her first proper save of the game by getting both hands around Renata Costa's volley from the edge of a crowded box. It was dipping, but well inside her near post.
48 min: Marta's shot is deflected over, but the corner only presents Britain with another chance to break. Aluko, who has featured relatively little so far, makes off down the right. Her cross is met by Smith, who heads firmly goalwards but doesn't place the ball out of Andreia's reach.
46 min: A big cheer as the teams reappear for the second half, which Aluko and Smith get going from the centre spot. Haven't heard of any changes to either side at the break - oop, no, Barcellos has made two, bringing on Daiane and Aline for Bruna and Maurine.
Half time: The referee's whistle pips and the crowd applaud the teams off the pitch - the cameras pick out faces of people looking almost bewildered by what they've seen so far. Britain have done really well since taking that early lead through Houghton.
"Where can I find the nationalities of this GB team?" wonders Michael Aston. "Hoping it's a bit more representative of the sceptered isle..." The original 18-player squad was made up of 16 English players and two Scots, but the injury to Scottish defender Iffy Dieke makes it 17-1, because her replacement, Dunia Susi, is English. Powell said she disregarded associations and picked the best 18 players available.
Just watching highlights from the Canada-Sweden game earlier - if the scores tonight stay as they are (New Zealand are beating Cameroon 1-0), GB would top the group and play Canada. Two close-range goals from wide deliveries scores by Tancredi, and very similar goals conceded at the other end, too.
45 min: Marta is furious that Sophie Bradley isn't booked for a tackle on Britain's right that stopped her getting into the box without any defensive company. Bradley got a touch on the ball but not without taking Marta down. Brazil fail to make anything of the free-kick, though; it's cleared at the first attempt.
42 min: A bit of a hold up here as Thaisinha is caught by Bradley. Smith seems to be in a bit of pain, too - perhaps still hurting from that challenge by Bruna.
40 min: This massive Wembley crowd is seeing a wonderful British performance so far - the interplay between Carney, Smith and Little is as good as Powell can have dreamed of. After a fast, swirling move down the left involving all three at various points, Carney spots Andreia off her line and tries a lob, but the keeper gets back to catch it.
38 min: Smith wins a corner with a jinking run at the byline on the right, but again Andreia punches clear. The ball is eventually put out for a GB throw, and Carney protests that Rosana illegally stops her from reaching it. The tussle is in the box, though, which probably dissuaded the referee from blowing her whistle.
36 min: Bardsley's palms sting as Cristiane's effort from a tight angle bounces off them, but the ball forward, which was fair zipping along, cross the byline before the Brazilian forward got the shot off.
33 min: Britain should have had a corner after Francielle swung her boot at Smith's cross, but the officials think Jill Scott got to it. She wasn't far off, but wasn't expecting the ball to reach her - Aluko swerved out of the way to let it run. Another fast break by Britain.
31 min: Bardsley hoofs clear rather awkwardly as a bobbling back pass from Bradley threatens her goal. Britain are breaking out quickly from these defensive moments though, and Bruna is booked for a nasty bodycheck on Smith as they go again down the left.
29 min: Smith shoots just wide of the righthand post! That was a nice move by Britain, the free-kick from Rosana's bodycheck sent up to Jill Scott, who nods it down to the left for the roving Smith to swivel her left foot at. She struck it very nicely but it doesn't swerve back in early enough.
28 min: The referee has a word with Rosana and Marta after the former slams Carney in the centre circle.
26 min: A worrying few moments for GB there! First Stoney was almost caught out by a long punt from Andreia, which dropped just shy of the edge of Bardsley's area to confuse the issue of responsibility, then Alex Scott almost heads into her own net trying to stop Cristiane's cross reaching Marta - it hit the post and bounced away to relative safety.
25 min: Not a fan of Thaisinha's two-tone 'do, but she worked some space on the right with a lovely bit of footwork there, slipping the ball into the middle for Cristiane to shoot. She tries to place it in the top corner but doesn't get enough lift or bend on it to trouble Bardsley.
22 min: Steph Houghton's at it again - she's only just beaten to Carney's chipped ball by the fist of Andreia. Brazil head directly for the GB goal, but Ester shoots wide.
21 min: Renata Costa shoots with a free-kick from about 45 yards out. It bobbles well wide. Meanwhile, here's Simon McMahon. "I am taking Mrs McMahon and our two daughters to Hampden on Friday for the women's QF match there. Can you tell me who will be playing because frankly I can't be bothered checking, and you seem like a nice sort, at least according to Rob Smyth, although maybe that's not the best recommendation." I'm actually pretty horrible, but I do know (or at least I think I know) that you'll be watching Sweden v France.
19 min: The cameras just pulled back to show Wembley almost full. Having watched England play in front of a few thousand at League One grounds, it really is an incredible sight to see a British women's team get this reception. So far they're getting the game they want, too, as Maurine's thwanged cross balloons into Bardsley's hands.
17 min Aluko wins a corner despite it seeming very much like she'd got the last touch, but there's not much fancy in the crowd for picking the officials up on that. Smith inswinger is headed away, but again GB nearly make something from the follow up, Cristiane having to make a backwards, skimming header to stop Carney's lofted cross from reaching Stoney.
15 min: "Doesn't Houghton play for Arsenal?" wonders Conor Smyth, and he's right, you know. "Taking on the Vermaelen goal-scoring CB role!" GB's defence is preventing Brazil from anything more than pot-shots at the moment, Renata Costa shooting high and Marta's effort held by Bardsley at her near post.
12 min: Aluko lashes the ball high into the stands to produce a rash ending to a decent chance for Britain - Scott slid across the turf to retrieve her first touch and push the ball back to Aluko a few yards behind the D, but the shrieking of the crowd can't help.
11 min: As far as formations go, GB look pretty much as expected, though Smith is dropping deep to come and get the ball and Jill Scott is pushing up given half a chance. Cristiane is playing furthest forward for Brazil, just ahead of Marta.
8 min: Marta tries one from range but Bardsley gathers it without too much bother. Moments later Marta pinches the ball off Carney in midfield and slides it through to Cristiane, who shapes her shot wide of the left post.
7 mins: A chance for Brazil as Cristiane shoots, but Bardsley seems fairly confident that it's gone wide as she moves to cover the post.
4 min: Neither side can quite believe the start to this game, and will need to settle down a bit. Hope Powell is shouting non-stop instructions from the touchline. It really was great work from Carney to get that ball back into the danger area and create the chance, and Houghton did incredibly well to turn a decent half-chance in to something. That's her third in three games. A centre back!
GOAL! GB take the lead in the second minute!
Steph Houghton, 2 mins: A decent start for Britain, this, you know. Smith's corner was headed away but Carney chased it out to the right and turned the ball back into the middle, where Houghton hopped away from the keeper with it and pinged it into the far side of the net from a tight angle.
1 min: After huddles at both ends, the referee Carol Anne Chenard blows the whistle and Marta rolls the ball to Cristiane to get the game going. Brazil are in yellow shirts and white shorts, GB in a fully dark blue strip.
The teams emerge from the tunnel to a reception that must send every last hair on the backs of their necks up. The Brazil players turn and face their flag for the national anthem, Marta tapping the badge on her shirt as she sings the first few lines. The British players stand arm in arm, buffeted by a huge cheer as the anthem is announced. "Come on!" shouts Stoney as the final notes play.
Hope Powell's been in front of the camera talking about the occasion:
"It will be undoubtedly a fantastic occasion. Hopefully the crowd will get on our side... we aim to enjoy it. We can play with some degree of freedom and fun; we want to do well tonight, we realise what's at stake, but we want to enjoy it."
The great bums-on-seats debate rumbles on. I hope this won't impact too heavily on the attendance - since the British record is about 53,000, Wembley should be comfortably above that.
15mins till kick off. About 15 blocks empty near centre. Bloody Olympic family.— Carrie Dunn (@carriesparkle) July 31, 2012
Smith talks in a BBC interview about ruffling Marta's feathers - Brazil were guilty at last summer's World Cup, for instance, of losing their cool when things didn't go their way.
"The girls cannot wait to get out on to the pitch," says former England midfielder Sue Smith, rocking a Megan Rapinoe-esque quiff in the BBC3 studio. "They're really confident."
Loving all your tweets of encouragement and support for— Kelly Smith (@kjs8eng) July 31, 2012
#TeamGB . WE CAN DO THIS! ⚽
It looks as though it'll be a 4-2-3-1 for GB on paper, with Kim Little playing behind Smith and Karen Carney and Eni Aluko out wide, but I'll update you on that as the game gets going. At the back, Sophie Bradley comes in for Dieke.
Great Britain: Bardsley; A Scott, Houghton, Stoney (C), Bradley; J Scott, Asante; Carney, Little, Aluko; Smith.
Barcellos makes a couple of changes from the team that squeezed past New Zealand: Fabiana and Formiga are given the heave-ho, with Thaisinha and Rosana coming in. I'd expect to see Marta sitting a little deeper than Thaisinha and Cristiane, but again, I'll report back on that once things are underway.
Brazil: Andreia, Maurine, Erika, Bruna, Rosana, Ester, Francielle, Renate Costa, Marta, Thaisinha, Cristiane.
We've spent days talking about empty seats, but if everyone who has bought or been given a ticket turns up at Wembley, Great Britain and Brazil will play in front of the biggest crowd for a women's football match seen on these shores since the second world war; they're expecting at least 75,000 in there tonight. That would be more than the combined attendance for the three games featuring England at the 2005 European Championships, staged in the north-west, so it's going to produce an atmosphere that the British players have not seen the likes of before.
Fortunately there is only so much pressure on Hope Powell's team: they and Brazil have already made it through to the quarter-finals having won their first two games, so this will “merely” decide which of them tops the group and gets to play a third-placed team from Group F or G. Whichever side finishes second will have to play World Cup holders Japan, who were held to a goalless draw by South Africa earlier today and dropped to second in Group F behind Sweden, who drew 2-2 with Canada.
Brazil will be strong favourites to win this and poop Great Britain's party, but after they thumped Cameroon 5-0 in their opener they could only beat New Zealand 1-0 and were made to wait until the final few minutes for that goal. GB's defence has been hit by the injury to Iffy Dieke*, but they will feel there's something for them in this. Look, here's Kelly Smith saying so: “We've got our own game plan, we're really confident going in to the game and we want to top the group."
Brazil have suggested that part of GB's game plan is to scupper their preparations, after the bus carrying them from Cardiff to London yesterday broke down leaving them stranded at the side of the road for five hours. “It was a disgrace,” said the coach, Jorge Barcellos, after seeing an empty 2012 bus flagged down but allowed on its way when it turned out the driver had worked too many hours to take them to London. Conspiracy, or your average day on public transport?
*Dieke ruptured cruciate ligaments in her knee during Saturday's 3-0 win over Cameroon to end her season. It was a cruel irony that in an extremely rough and physical game (Anita Asante was subbed off after getting kicked in the face but is fit to play today, and Smith was taken off as a precaution after some brutal treatment in the first half), Dieke turned her knee in the midst of what looked like an innocuous tussle for possession.