England close on 68-3, trailing by 195 runs
Hosts reduce Australia to 85-4 before stunning Marsh century takes tourists to 240-5 at tea
But Australia then lose 6-23 to be dismissed for 263 as Wood takes superb 5-34
England drop four catches - Root & Bairstow two each
Robinson goes off mid-over in second session with a back spasm
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Appeals from England as Chris Woakes raps Marnus Labuschagne on the pads.
It's prolonged appeal, they like it, but Ben Stokes, stood at short fine leg, gestures that it was going over.
The England captain is right too, it was going down as well.
It wakes the Western Terrace up, though.
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Scary thought but the Aussies will be bowling even quicker! 😱
Jon from Bishop’s Stortford
Than Mark Wood? I wouldn't think so, Jon...
Daniel Norcross
BBC Test Match Special
It's annoying as a fast bowler to watch the batters rotating the strike so well. In the context of this game, this is a really important partnership.
Steve Smith and Marnus Labuschagne seem happy to just calm things down at the moment.
Smith, who is playing his 100th Test, works a single into mid-wicket.
Glenn McGrath
Ex-Australia bowler on BBC Test Match Special
Extreme pace is very rare commodity. You can't really teach it, you're born with it.
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When he’s fit and in that mood, Mark Wood is unplayable. What a weapon for a captain to have.
Tom in Northants
Wood has outrageous pace nowadays, combined with much better accuracy.
Anon
There are words that describe a wicket very succinctly on their own... 'snaffled', 'plucked', 'tickled'. For that Wood ball, only 'splattered' is required!
Ross Brooker, Milton Keynes
Any leave that misses the stumps is a good leave, I suppose, but Marnus Labuschagne draws oohs and aahs from the Headingley crowd as a Chris Woakes delivery just goes over middle and off stump.
It's been a cracking 75 minutes so far.
Glenn McGrath
Ex-Australia bowler on BBC Test Match Special
That ball from Mark Wood was far too quick, there should be a limit on how quick you can bowl and the good thing is Khawaja stayed in this crease... didn't help him though.
Wood removes Khawaja with 95mph ball
Sir Alastair Cook
Former England captain on BBC Test Match Special
Steve Smith's stats against extreme pace are good but starting against pace is really difficult.
What's underestimated about Wood is his ability to swing the ball both ways.
Labuschagne 17, Smith 1
It's a different pace from Ollie Robinson, but it is still causing problems for Australia.
A lovely bit of movement back in beats Marnus Labuschagne all ends up but it is too high for a serious lbw appeal.
There's almost some confusion in the running between Labuschagne and Steve Smith too, but the former just about gets back in time.
Matthew Henry
BBC Sport at Headingley
First chants of “we saw you cry on the tele” from the Western Terrace to Steve Smith.
Andy Zaltzman
Cricket statistician on Test Match Special
Mark Wood bowled four overs, three of which were maidens and had figures of 1-2.
Booooo.
Mark Wood is off.
Ollie Robinson is back on.
Short, sharp spells for the England seamers this morning.
Mark Wood bowling Usman Khawaja at 95mph?
Go on then...
Wood removes Khawaja with 95mph ball
A slight pressure reliever as Marnus Labuschagne is able to drive Chris Woakes through the covers for four.
That ends a run of 22 dots to Labuschagne.
Stumps splattered...
Image source, Reuters
Tom Mallows
BBC Sport at Headingley
The whole of Headingley rose to its feet after that Mark Wood wicket, with audible oohs and ahhs as the replay was shown on the big screen.
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Jason: There's no better sound in cricket than that of Aussie stumps being sent flying.
Rob Meech: That’s what pace does!
Josh Land: Shows what we’ve been missing. Let’s run through them now!
What is going on here?
The fourth umpire has come out with the case of balls.
Has Mark Wood damaged the ball taking that wicket?
Steve Smith is the new batter.
He is roundly booed to the crease by the Headingley crowd.
It is Smith's 100th Test.