Clarke and Smith are running really well between the sticks. Have turned two singles into two sets of 2 runs.
Broad strikes Smith on the pads and it's not given out, hawkeye shows it's hitting but the umpire hasn't given it and they've got no reviews. I think Broad is going to cry.
It was hitting middle of middle and Broad is still stuck on 199 Test wickets.
These umpires are all having a shocker. The trouble is they can't be benched because all the other ICC elite umpires are either Australian or English.
Swann has the hump as Clarke hits the final ball of his over for four. He's moved on to 66* and is looking very solid despite the fact his back is clearly troubling him
We have another delay as the groundsman and his little truck come on to try and repair the footholes.
The paying spectators are being cheated out of overs because of the DRS taking so long and the ground having to be repaired 3 times. Clarke changed his gloves 3 times as well.
England are getting frustrated as Smith edges one wide of slip - given that he's effectively 25 for 3 they are getting a bit riled with him still being there!
It's all gone very sedate. Clarke and Smith are plodding. Broad is battling away like the trooper he is but that 200th Test wicket is proving elusive still.
Clarke has moved into the 80's by steering a short ball from Broad over the slips.
Clarke has well and truly found his range now, he plays a beautiful flashing drive off Anderson to move on to 87*
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There's a definite air of frustration from England. Clarke and Smith are looking pretty unshiftable
Broad has limped off the field. The Sub Ben Foakes is on.
Well well well. It seems the momentum (if that's a thing) has shifted towards Australia.....
Clarke moves on to 90* and this partnership on to 96. The England bowlers are visibly tiring.
Broad is still off the pitch which is a bit of a worry. He's out bowled Anderson today for the most part and deserved more than he's got.
Broad is back on now and he's not limping. Cook has brought Swann on from the Pavilion End.
Steve Smith has played very welll if you ignore the fact he's been out twice probably three times but to give him credit he's battling on very well.
Clarke has moved on to 95 with a gorgeous cover drive off Bresnan. But actually the way he props forward and defends is the most impressive thing about Clarke. He gets either fully forward or fully back. There's not that many Test batsmen that do that as well as him.
England's bowling has become more and more inocuous as the day has gone on. It's hot and draining and they are tiring. Clarke has moved on to 99 and Smith on to 43.
There it is - Clarke reaches his 24th Test century and after struggling early on against Anderson he's gone on to play a beautiful innings and particularly showing that he is probably the best player of spin in the world
The new ball is due in 2 overs time.
Cook has brought Trott on from the Statham End to have a trundle until the new ball is due
And Clarke plays an absolutely glorious on drive straight back past him to take him on to 109*
That'll probably be the end of Trott's spell. The new ball is available.
The new ball has been taken and Steve Smith has a massive mow through midwicket for 4. To the amusement of the crowd.
Anderson looks seriously dischuffed