First change for the West Indies as Alzarri Joseph replaces Jayden Seales, but hold on, we're going have to stop for a second - a deflated unicorn balloon has drifted onto the field at Trent Bridge.

A member of groundstaff nabs it on the second attempt and we can continue.

Harry Brook, perhaps inspired with a bit of unicorn magic, fires Joseph down to long-on. Seales attempts to stop the ball on the slide, but replays show he was in contact with the boundary sponge when knocking the ball back - that's four.

Brook moves into the 90s.

Phil Tufnell
Former England spinner on BBC Test Match Special

Image source, Getty Images

That's the perceived weakness for Harry Brook, against the short ball. But that was a belter, it just came angling in at him.

Oooof, a sharp bouncer from Shamar Joseph gets Harry Brook in a muddle.

He attempts a hook, but can't get bat on ball.

Lovely stuff.

Classic straight drive from Harry Brook, sending the ball past Jayden Seales, to the right of mid-off, straight to the ropes.

Phil Tufnell
Former England spinner on BBC Test Match Special

Image source, Getty Images

I think the pitch might be getting lower. No bounce at there hardly from back of a length and Root got well forward and rode it and knocked it down.

Like Brook before him, Joe Root scores his first runs of the day down at third.

The fielder can't cut this shot off though - it goes for four.

Gary, Bedfordshire

Brook kindly deigns to his partner the strike, taking a single from the fourth ball of Seales' over.

Joe Root starts with two dot balls.

Jonathan Agnew
BBC cricket correspondent

Image source, PA Media

West Indies are taking a slip out already. They're just going to try and make it hard for England to score at the rate they want to and hope that brings the odd rash shot.

You're not going to blow a team out on this pitch.

Harry Brook is hogging the strike - he's faced all 12 balls this morning.

He works Shamar Joseph into the leg side for two, then takes a single from the final ball of the over to ensure he'll face the 13th ball of the session as well.

Phil Tufnell
Former England spinner on BBC Test Match Special

Just such a natural shot.

England will need a bit of time on this pitch because it's flat.

Jonathan Agnew
BBC cricket correspondent

No messing around there. Nothing flamboyant about it, not particular effort about it.

The perfect shot for that ball and Brook has dispatched it.

Brook picks up his runs of the day, running two after seeing the ball cut off at the third boundary.

No stopping his next shot, a textbook drive through the covers brings four.

Phil Tufnell
Former England spinner on BBC Test Match Special

This is why we're all on the edge of our seats.

Jonathan Agnew
BBC cricket correspondent

Isn't Test cricket wonderful when you really don't know where it is going to go? It could go in all different directions.

Joe Root and Harry Brook have spent the last minutes stood on the boundary, doing some shadow batting.

They've now ventured onto the field, where Jayden Seales looks set to bowl the first over.

Carlos Brathwaite
Former West Indies all-rounder on BBC Sounds

England will push hard and give themselves a little bit more time. That will put West Indies under pressure and they will be defensive and that will allow England to push again.

Jonathan Agnew
BBC cricket correspondent

I'm really looking forward to today.

Ros Lowestoft

Fazeer Mohammed
West Indies commentator on BBC Test Match Special

The West Indies have got to believe. It's a cliche, but that's the way it is. They've got to be consistent with their bowling effort this morning.