Robinson delivers a testing maiden, a solid start to his post-lunch spell.

The tactic of building pressure at one end and then completely easing it at the other is ... confusing.

Ollie Robinson replaces Mark Wood and immediately draws a play and a miss from Harris.

Hmm. It's almost as if pace bowling is the way to go here.

A beach ball is retrieved from a lively section of the crowd, which is the most exciting thing to happen in that Jack Leach over.

Elliott Baker: Why is Root setting these fields for Leach, yet when he bowls he sets fields for himself because he thinks he's a better bowler than Leach? But he still turns to Leach before himself!

Samuel Peskett: Have the quicks injured themselves eating lunch? Why are we bowling Jack Leach to left-handers when we need wickets? At this point I wouldn't be surprised the England boys each have two pints of coffee before bed.

Ooohs and aaahs as Mark Wood's extra pace causes Harris to waft outside the off stump from the first and last balls of the over.

Judging from our mentions on social media, the post-lunch tactics are baffling many of you.

Marcus Harris is doing a fine job for Australia today. With their big names in Warner, Labuschagne and Smith out, he's dug in and eased a lot of the pressure on his team.

Dirk Nannes
Former Australia bowler on BBC Test Match Special

As Australia close in on England's total the tourists have to start taking wickets. Mark Wood's fire and brimstone brings that element of threat even if he goes at four an over. Jack Leach is going at four an over without that threat! If you're not causing a threat, you may as well be bowling part timers.

Oooh, close! The batters drop and run for a quick single, Ben Stokes fields but his throw is wide of the stumps.

Marcus Harris then helps himself to the single on the leg side that is gifted to him.

The difference in pressure from Leach's bowling compared to when Nathan Lyon bowls is remarkable.

Mark Wood pulls things back a little by delivering a maiden but Marcus Harris doesn't seem particularly troubled.

Image source, Getty Images

Rafabenathus: How’s Leach ever taking a wicket with these tactics?! Utter rubbish from Root, first glimpse of a way into the game and it’s bottled.

Dirk Nannes
Former Australia bowler on BBC Test Match Special

It's difficult to work out how Jack Leach is getting a wicket here here with this field. He's bowling the ball in at the pads of two left-handers, round the wicket, and it's strange given England had success with seamers before lunch to see him continuing after the break.

This Leach tactic is baffling me. I really hope I'm proved wrong, but he is bowling a lot of balls on the leg stump and gifting runs away, really.

There is, quite simply, no pressure.

James Anderson took one wicket for one run this morning, remember.

Mark Wood gifts Harris some width outside the off stump and he guides it past a diving backward point for four more.

A few more twos bring Australia 10 runs from the over.

Not the start England would've wanted after the break.

Alison Mitchell
BBC Test Match Special

Marcus Harris has gone some way to answering the questions about his place in the side with a half-century in the Boxing Day Test.

50 for Marcus Harrispublished at 02:45 Greenwich Mean Time 27 December 2021

02:45 GMT 27 December 2021

The opener drives Mark Wood firmly down the ground to reach his half-century. He's rode his luck but also navigated periods of pressure really well.

Here's Mark Wood, competing in the lunchtime Ashes wheelbarrow race.

Image source, Getty Images

Caleb: Really important England sustain the pressure in this coming session. It hasn't been the creating of opportunities that has cost them this series, it's been the follow-up.

I fear this may be an occasion where England's tactics are questioned once again.

Leach bowling to two left handers with the most defensive field you can imagine after the fast bowlers were so good this morning - it seems a strange decision.