It's getting a bit grey and grim at Lord's - basically, it's the sort of conditions you really, really want to bowl in.

A maiden for P Siddy.

Bowser: Think Australia are favourites if there is going to be a winner here. England could easily collapse for 140 all out and Australia will chase that down with ease. Tough session ahead.

Tim Paine rings in the changes - Peter Siddle replaces Pat Cummins, who has figures of 5-1-8-2.

Louis: Losing the captaincy has been good for Smith's batting... I'm not saying Root should lose it, but...

John Hewitt: Root must be "rested" surely. I don't know which is worse his captaincy or his batting Both truly awful.

Jonathan Agnew
BBC cricket correspondent

Denly has to set his stall out to bat all day. It is still a long way off.

A couple of clipped singles end this latest Josh Hazlewood over.

Frank in London: Everyone needs to calm down. England should still get a 200 run lead and it will be tough for Aussies to get that with Smith a bit shaken.

Jonathan Agnew
BBC cricket correspondent

I think these fairy rings on the pitch has something to do with it. How did that ball get up so high?

Eng 21-2published at 9.4 overs

9.4 overs

Oh, ow!

Josh Hazlewood gets a delivery to jag back sharply and it hits Joe Denly on the wrist before cannoning into his stomach. That'll leave him a bit winded.

Chris Mitchell: Joe Root, do yourself and your country a favour and quit now. We need you for your batting, not your dull and questionable captaincy. Give it to one leader in the team - Ben Stokes.

Chris Philcox: The sooner Root resigns as captain the better for the team and for his batting.

Luke: Root looking lost at sea all series .. should not be captain.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

The Root wicket was a beautiful ball in the corridor. It doesn't matter who you are. Root might think he could have got further forward but it is very hard first ball.

Nathan Lyon is limbering up by doing some odd yoga poses.

Pat Cummins steams in to Rory Burns, who plays with a slightly angled bat before he flicks a couple of runs off his hip.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

If Roy batted down the order with a softer ball he might score some runs but at the top his technique is not good enough.

Michael Shaw in Plymouth: This is why England need to ditch the experiment of Roy opening. He is not a Test match opener and exposes Root, our best player to the new ball.

Theo HV: I’d rather he just took on the short ball than tamely get out.

Geoffrey Boycott
Ex-England batsman on BBC Test Match Special

England could score 80-100 runs tonight. They can't win it but they certainly can lose the match tonight.

Remember in 2011, when England were the number one team in the world with Strauss and Cook and Trott up top, and people complained that they were too boring?

Give me boring and 100-0 than drama and 9-2 any old day of the week.

Nick in Kent: Clever what we're doing here, getting Australia back in before Smith is back from hospital.....just shame the total to defend will be less than 50.

A horror couple of minutes for England.

Harry in Doncaster: Does everyone forget we beat India here 4-1 last summer? Get the pitches green and bring in Curran and an experienced first class opener and we're back in this for the three other Tests!

Josh Hazlewood has an absolute 'mare, slipping on his backside as he tries to field in the deep, and England scamper an extra run as the crowd get on at Hazlewood.

Hazlewood looks a bit rueful but there's a big grin on his face as he jogs over for a drink.