Postpublished at 02:41 Greenwich Mean Time 7 January 2018
Michael Vaughan
Ex-England captain on BBC Test Match Special
That's a monster!
Root 42*, Bairstow 17*
Two wickets for Lyon
Aus 649-7 dec - lead of 303
S Marsh 156, M Marsh 101
Moeen 2-170, Crane 1-193
Australia lead five-Test series 3-0
Day five starts at 23:30 GMT
Jack Skelton and Amy Lofthouse
Michael Vaughan
Ex-England captain on BBC Test Match Special
That's a monster!
Sharp turn from Moeen and Starc chases it but wisely pulls out of the shot.
No pulling out of that one though - Moeen goes full and Starc batters it away over mid-wicket and into the stands.
291 balls, 18 fours
Michael Vaughan
Ex-England captain on BBC Test Match Special
This is Broad's chance for his 400th wicket. Starc is surely going to play a shot or two.
Paine 26, Starc 5
Paine punches down the ground for what looks like four, but Moeen - ignoring the heat and the state of the game - chases it admirably all the way and pulls it in, saving a run.
Broad to Starc - it keeps low into the pads and Broad puts in a halfhearted lbw appeal but that was sliding miles down leg.
Starc guides away for two, then flays at a straight one, misses and Bairstow makes a decent diving catch behind. Oh, the keeper wants a review - don't think there was any noise. Joe Root wisely says no - snicko confirms there was no edge.
Stephan Shemilt
BBC Sport in Sydney
Roger that. It's 42 degrees.
Andy Zaltzman
BBC Test Match Special statistician
This is the fifth time in 15 away Tests since New Year 2016 that England have conceded 600. They conceded 600+ away from home five times between 1955 and 2015 (none from 1955 to Dec 2003).
Lead by 255
Mitchell Starc is the new man in - expect him to try and batter a few boundaries.
He has to settle for a one and a two to start, but does take Australia past the 600 mark.
Andrew Samson
BBC Test Match Special statistician
Shaun Marsh's 156 came from 291 balls in 403 minutes, with 18 fours. At this stage of the series he has 445 runs at 74.16.
A magnificent knock from Shaun Marsh, building on fine work from the top order to really grind England down.
To say England's celebration was muted would be to overstate it. Mark Stoneman pulled off a blinder but barely shrugged.
Michael Vaughan
Ex-England captain on BBC Test Match Special
A tremendous ovation for Shaun Marsh - he has had a tremendous series. He's a fine player.
Ed Smith
Ex-England batsman on BBC Test Match Special
It's a tame end to an excellent innings.
S Marsh run out (Stoneman) 156 (Aus 596-6)
Well when you are on 156 and it's 42 degrees, you're allowed not to sprint a quick single.
Tim Paine knocks it into the covers and Shaun Marsh is sluggish taking off.
It's a tremendous piece of fielding from Mark Stoneman, mind. He picks up cleanly and quickly scythes down the stumps, with Marsh stranded.
Andrew Samson
BBC Test Match Special statistician
This is Shaun Marsh's second score of 150 or more in Tests. It came up in 392 minutes, off 283 balls, with 17 fours.
Michael Vaughan
Ex-England captain on BBC Test Match Special
You get the sense from Steve Smith that he wants to keep England out there - he wants to make them melt.
Lead by 244
Mix-up between Marsh and Paine after the former cuts away Moeen - chance if England throw to the bowler's end... but they don't and Paine scampers back in time.
And then Marsh dances down the pitch and whacks Moeen over his head for four.
Moeen then gets the last to keep very low. Warning signs - Nathan Lyon will have enjoyed watching that delivery.
Ed Smith
Ex-England batsman on BBC Test Match Special
Pretty understated celebrations from Shaun Marsh.
Aus 584-5
An irked Stuart Broad strays straight and Marsh clips it away for three - that's his 150. Terrific innings. Muted celebration. All about setting up Australia's victory charge now.
Text 81111
To the person on night out refreshing their phone, I wouldn't bother, just enjoy your night.
Neil, Liverpool
The players are back out at a scorching SCG.
Stuart Broad has the ball in his hand.
Will we finally be able to use the 400 Test wickets graphic we've had prepared since day two?
He's one away...but that's felt very far away. Anyway, here we go...