Forty-five minutes in and we've got two decent shocks on our hands. Non-league Blyth Spartans, who are leading 2-0 against Birmingham, and League One Rochdale, who are dominating and should be more than 1-0 up against Nottingham Forest, are flying the flag for the minnows. Plenty of time to add a couple more to that list, though.

Former Tottenham manager David Pleat
at Hawthorns for BBC Radio 5 live sports extra

"The visitors haven't been overawed and started very well, seemingly very comfortable on the ball. And a frustrated Tony Pulis came down to his technical area to berate his players.

"But Anichebe's goal, West Brom's second, really was vital. Gateshead go into the tunnel at half-time utterly deflated. West Brom will know how fortuitous their lead is, but it's now a lead I expect them to exploit to the full."

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Reporter Will Perry at Prenton Park: "The gulf in class there for all to see at the moment.

"Before the goal even came from Nathan Dyer, it was all Swansea.

"Max Power has had the best chance for Tranmere when his shot was spilled from distance by Swansea goalkeeper Gerhard Tremmel, but he was able to pounce on the rebound."

Indeed Southport can hold on to the goalless scoreline at the break. Impressive stuff from the Conference visitors, who are cheered off of the Pride Park pitch by their 2,700 delighted - and vociferous - fans.

Image source, Getty Images

BBC Radio 5 live

A reminder of what Birmingham boss Gary Rowett told 5 live Sport before kick-off: "We've worked very, very hard this week in terms of preparing the players for something that little bit different. We respect anyone we play. I've played in lower league teams who have beaten bigger teams. But our mentality is key today. We trained on a very, very poor pitch we've got at the top of our training ground to prepare them for today.

"We know if we play well and use our athleticism and quality then we should win the game. But we also know that if we don't perform we could lose. That's what the cup is all about. Today is a brilliant occasion - we all love the FA Cup. Here's hoping it's a great day for both teams."

The second half of Blyth Spartans v Birmingham is live on BBC Radio 5 live.

BBC Final Score

Reporter Lynsey Hooper at The Valley: "Charlton and Blackburn players are running end to end now to keep loose as this floodlight failure delay continues.

"Charlton were having the better of the chances before the delay despite Blackburn having the lead."

Half-time whistles blowing across the country. Get the kettle on and bask in the potential Cupsets on the cards.

Almost three nil! Danny Maguire twists and turns away from Michael Morrison and cracks in a left-footed strike which Colin Doyle tips over the bar. And that's half time!

So far so good for the impressive Swans, who are dominating in every sense.

Image source, AFP

Just too strong.

Victor Anichebe holds off Ben Clark inside the box to swivel and fire an angled shot into the corner with the last kick of the first half.

West Brom lead 2-0 but are very, fortunate to do so. Gateshead have been the better side before getting caught by a late one-two punch.

Image source, Reuters

Championship promotion hopefuls Derby have enjoyed 70% of possession. They have had 13 shots at goal. But only one has hit the target. That's the same number as Conference visitors Southport, who are defending doggedly. Can they hold on until the break?

The FA Cup forgot to stop off at Huddersfield on its way to Blyth Spartans and sprinkle some of its magic. Not a single shot on or off target from either the Terriers or Reading with about a minute to go until half-time.

How have Rochdale not made it 2-0 there? Jamie Allen is dispossessed by Danny Fox in front of an open goal after Matt Done had rounded the keeper.

Bournemouth's Shaun MacDonald keeps his cool to slot beyond Rotherham goalkeeper Adam Collin following a deflected through ball in the box. It is a deserved equaliser for the Championship leaders after a sustained period of pressure.

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Pundit Steve Claridge on Robbie Dale's second goal for Blyth: "Birmingham scored a goal last week against Forest exactly the same as that where the shot came through a group of players in the penalty area. So they clearly haven't learnt anything.

"He looks a player though Robbie Dale. A completely different finish from the first goal. Showed some great awareness and skill there."

Big penalty appeal for Doncaster as a shot appears to strike Luke Ayling on the arm - nothing given though...

Image source, @stephedmonster

Steph Edmondson tweeted this picture via #getcarriedaway, external

Former Newcastle and England winger Chris Waddle
at Croft Park for 5 live Sport

"Robbie Dale ran inside, beats one, then sold a defender and cut inside before a lovely finish, rolling it into the bottom corner. Colin Doyle didn't even dive. Blyth have been superb but Gary Rowett, the Birmingham manager, might make all three of his substitutions at half time. His team have been simply dreadful."

Someone cranks The Valley's floodlights back into life as the players re-emerge into the ever-increasing light. Game on between the two Championship sides. Again.

Gateshead have more than matched West Brom so far, but their defence folds with the first piece of Premier League pressure.

Victor Anichebe flashes a shot goalwards, Craig Dawson swips a backheel at the rebound, but it is Saido Berahino who applies the decisive touch, burying from 15 yards past a helpless Adam Bartlett.

Image source, Getty Images