HALF-TIMEpublished at 20:48 Greenwich Mean Time 7 February
Aston Villa 0-2 Chelsea
Chelsea's best 45 minutes of the season?
Use audio icons at top of page to listen to BBC radio commentaries
FT: Nottingham Forest 1-1 Bristol City - Origi opens scoring & Knight levels, before hosts win 5-3 on penalties
Forest will now host Man Utd
FT: Aston Villa 1-3 Chelsea - Gallagher opens scoring & Jackson doubles lead before superb Fernandez free-kick; Diaby pulls one back
Chelsea will host Leeds United next
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Neil Johnston
Aston Villa 0-2 Chelsea
Chelsea's best 45 minutes of the season?
Aston Villa 0-2 Chelsea
A sweetly struck attempt by John McGinn looks to be heading in until Djordje Petrovic sticks out a big hand to turn it over.
Aston Villa 0-2 Chelsea
Unai Emery looks furious. Villa have been unrecognisable. A big half-time team talk coming up from the Spaniard.
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Fear not Villa fans. One goal and the Chelsea heads will go down and it’ll be a completely different game.
Mark
Aston Villa 0-2 Chelsea
A reminder that the winners of this tie are at home to Leeds on 28 February.
As it stands it will be Chelsea v Leeds at Stamford Bridge.
Tasty.
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Mark: Chelsea playing like Villa and Villa playing like Chelsea... what's going on!? Hoping for a game of two halves!
Stu: Gusto playing with gusto…
Andrew: Have Chelsea turned a corner? Too early to say, but the indicators on at least. Spent enough time sending their fans round the bend!
Aston Villa 0-2 Chelsea
Dion Dublin
Former England striker on BBC Radio 5 Live
Disasi and Badiashile are marshalling that back-four and it is working for Chelsea.
Very organised at the moment, Chelsea.
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Looks like Thiago Silva's wife was right when she said it was time to change. Ditch Thiago.
Anon
Aston Villa 0-2 Chelsea
Nine attempts. Five on target. Two goals.
Chelsea are having the time of their lives at Villa Park.
And they're doing it in front of 7,000 travelling fans who are lapping it up after having little to cheer this season.
HT: Nottingham Forest 1-1 Bristol City
Michael Brown
Former Tottenham midfielder on BBC Radio 5 Live
Wonderful effort and wonderful desire from this Bristol City side to get back into the game.
Aston Villa 0-2 Chelsea
Noni Madueke is having the game of his life at Villa Park. He is causing all sorts of problems with his pace and intelligent passing.
Aston Villa 0-2 Chelsea
Chelsea are on fire!
They are completely dominant and Cole Palmer is the latest to test Emiliano Martínez with a curling attempt from the edge of the box.
Nottingham Forest 1-1 Bristol City
We're still no nearer discovering who Manchester United will be playing in the next round.
Aston Villa 0-2 Chelsea
Chelsea are so on top that even Ben Chilwell decides to have a pop from distance. It's not a bad effort from the skipper and flashes narrowly wide.
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Stu: Times have changed to such an extent that I’m not counting on a result, but it’s unbelievably refreshing to see Chelsea players pushing themselves, playing with tempo and talking to each other.
Adam: Chelsea and cup football. I wish people would learn.
Aston Villa 0-2 Chelsea
The question all the experts are asking: will Thiago Silva's wife be tweeting after this?
Aston Villa 0-2 Chelsea
Dion Dublin
Former England striker on BBC Radio 5 Live
There is a swagger about Chelsea.
Enzo Fernandez in the middle what he is doing is having his back to Villa and swinging that right foot to play it towards Malo Gusto down that right.
At the moment, Chelsea are getting down the wings at will.
Nottingham Forest 1-1 Bristol City
Fifteen attempts. Seven on target. Two goals.
Terrific entertainment at the City Ground where the tie is evenly poised with half time looming.
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Mike: ' Fortress ' Villa Park is starting to look like a den.
Ares: Can't believe what I'm seeing at Villa Park.
Nick: A long way to go but … Chelsea ripping Villa to shreds. This is more like it boys!
Aston Villa 0-2 Chelsea
Phil McNulty
BBC Sport chief football writer at Villa Park
The sound you hear is a script being torn up. Chelsea have been bursting with confidence since going ahead and now have that healthy lead. Aston Villa’s fans cannot believe what they are seeing here. Chelsea in crisis? Not so far tonight. Villa still have plenty of time but they are in trouble.