Image source, Opta

For 200-300 Steve Smith is going to bring out the straight drive.

Vic Marks
Ex-England spinner on BBC Test Match Special

To all of us watching, we thought Smith was bound to get a double hundred. But for Smith, it was a moment of real joy and release. He's on 200 and I don't think he's going to change tempo much, either. He's just going to keep going.

Andrew Samson
BBC Test Match Special statistician

Steve Smith's 200 came from 301 balls with 26 fours and one six in 459 minutes.

Simon Mann
BBC Test Match Special commentator

How do you get him out?

The first double hundred in an Ashes match by a captain since Allan Border in 1993. The partnership is up to 212, the lead is up to 57.

Simon Mann
BBC Test Match Special commentator

It seemed as inevitable as the sun rising in the morning. He's enjoying the moment as well.

200 for Steve Smithpublished at 08:05 Greenwich Mean Time 16 December 2017

08:05 GMT 16 December 2017

You have to say that's magnificent. Steve Smith goes to 200, and the way he's going he may only be halfway through.

He brings up the landmark with a push off the bowling of Moeen Ali. He celebrates wildly, and quite right too.

How many more can he score? And will he give an England bowler a sniff of a chance?!

Image source, Getty Images

Andrew Samson
BBC Test Match Special statistician

Steve Smith was dismissed on 199 against West Indies at Kingston in 2015.

Thanks Amy - this has been a tough day in the comms box, I can't imagine what it's been like in the field.

Alastair Cook has been fielding at slip for the best part of 24 hours. He's not taken a catch, I don't think he's even seen the ball...

Graeme Swann
Ex-England spinner on BBC Radio 5 live

When England were 360/4 I didn't hear one Australian in the crowd say 'we are garbage!' 'Throw the towel in.'

Their psyche doesn't allow for that.

Perspective needs to be thrown into the pot. We are doom and gloom merchants.

Jack Tanner: Is it too soon to say Steve Smith is one of the greatest Test batsmen of all time? His numbers are certainly up there.

Image source, Getty Images

England are all out of ideas. Just give everyone a bowl at this stage.

I'm off for a bit. Tom Rostance will guide you through the rest of the innings.

Steve Smith works a single from Moeen's first ball to take him within two runs of a double century. There's nothing happening for Moeen. No turn, no bounce, no drift.

There's a brief flicker of interest as Mitch Marsh tries to smack a delivery through short leg, but Mark Stoneman thrusts his pads in the way. Marsh is trying to get after Moeen, walking down the wicket and cracking the ball away, before he punches a drive for four.

Stephan Shemilt
BBC Sport in Perth

Much cooler now, very pleasant to be outside, unless you're an England fielder. The clouds above represent the darkness of the situation they find themselves in. It would be English luck if the promised rain arrived overnight, rather than a time to save them.

Aus 453-4published at 123 overs

123 overs

Oh! Joe Root has, um, just taken a blow in a very painful area. Steve Smith chips a delivery back at him, it bounces through Root's hands and up into his middle section. Root makes an "ooft" noise and then doubles over, half in discomfort, half in amusement.

Smith pushes a single down the ground, helped by Stuart Broad, diving over it, before a chip through the covers by Mitch Marsh adds another one.

Joe Root's bringing himself on!

Moeen whirls his way through another tidy over, with Smith tapping a single down the ground before Marsh defends the rest of the over.

It's been so long since I saw a wicket that I'm beginning to wonder if I dreamed Moeen's strike this morning.