Captain Denesh Ramdin is the new batsman, with two slips, leg slip, short leg, short cover and short mid-wicket waiting for a tickle. Make the batsman sweat. Ramdin fends off a couple to mid-wicket as Root competes a wicket maiden. Root's bowling figures - 6-4-6-2 - would be as impressive in tennis as they are in cricket.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"This is turning out to be the perfect session for England. It was a slingy kind of ball that went on with the arm, beat the inside edge and trapped Chanderpaul in front."

Ed Smith
Ex-England batsman on BBC Test Match Special

"Joe Root has engineered an absolutely vital breakthrough. The West Indies' most likely match-saver has gone."

Listen to TMS commentary via the audio icon (available in UK only).

Impact in line, hitting leg stump two-thirds of the way up - and a big, big wicket for England, as the proverbial immovable object has been removed. Amazingly, on a slow wicket, it's the first lbw of the match.

Given the amount of stick Cook gets on here for just about every captaincy decision that's not Brearleyesque, I think he deserves congratulations for that bowling change.

Scorecard

Image source, Getty Images

Ed Smith
Ex-England batsman on BBC Test Match Special

"Outside the line is the only thing that can save him."

Root traps Chanderpaul on the crease and appeals, umpire Davis raises his finger - but while the young Yorkshireman wheels away in a manic celebration, "The Crab" signals for a review...

Matt in Newcastle: As the Crab gets settled, no doubt for a long stint, I suggest a new variant of Boycott Bingo, #BBCCricket Bingo. Suggested starting points: "Declared too late", "Bring in Rashid" and "Laughing Australians".

Blackwood is still bubbling over with aggression now and again, a flashing drive finds the edge but it disappears between second slip and gully for four. Just when I was about to praise England's over-rate for once (they're set to bowl MORE than 30 overs in this session - see, it can be done), there's a delay, albeit not one of their making, as umpire Billy Bowden's hat blows away and Chris Jordan has to run to retrieve it.

Jon Dunn: England need to use Stokes as a batsman/5th bowler. He should model himself on Watson/Kallis.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"I think Joe Root will get better and better as a bowler over the years. I think we'll see him used a lot more in one-day cricket as well."

Listen to TMS commentary via the audio icon (available in UK only).

Tredwell off as England turn to the golden arm of fellow off-spinner Joe Root who made that crucial breakthrough last night. Long sleeves fluttering in the breeze, Root bowls to Chanderpaul who offers no shot, thrusting his pad forward. Review? Not this time (and the ball-tracker agrees, showing it missing the wickets). Chanderpaul guides a two through mid-wicket, but it's a tidy over from the young Sheffield United fan - it even looks as though the last ball was a leg break.

One Cricket Fan: With all the talk of Anderson, no one noticed that Root equalled @Aggerscricket Test wicket record this match.

In fact, Root has overtaken Aggers - he now has five Test wickets to Aggers' four.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"If Shivnarine Chanderpaul gets through to tea, I think the West Indies have got a great chance. If he he goes before then, we could be leaving the ground early."

Chanderpaul knocks a single to square leg, he'll already have one eye on batting through to lunch but can he get young Blackwood through the next 25 minutes unscathed? The Jamaican takes a two off his legs.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"That shot from Devon Smith has to be in the top three worst shots of all time. The partnership between him and Samuels seemed to have taken the sting out of the game."

Listen to TMS commentary via the audio icon (available in UK only).

Chanderpaul sweeps Tredwell for a single, Blackwood takes the aggressive route again but can only blast the ball back to the bowler. West Indies will hope he learned from watching Smith and Samuels self-destruct this morning.

Sir Viv Richards
Ex-West Indies captain on BBC Test Match Special

"When Blackwood defends, he looks pretty good. Technically, at times the West Indies batsmen look as good as any. You wonder why they're not kicking on and taking advantage of some pretty good batting conditions."

Aggers was right - Anderson is off, probably until after lunch, and Ben Stokes is on for the first time on day five. Blackwood drives past the two short covers for a two, before a single takes him into double figures.

With the Anderson excitement over for now, can England nip another one out in the half-hour before lunch?

Joe Wilson
BBC News sports correspondent

On Twitter:, external "When you consider Anderson's 269 ODI wickets as well he really is a modern marvel of skill and stamina. Cricket's AP McCoy?"

Four men round the bat for Chanderpaul, clinging on grimly as only someone with his awkward, crustacean-style stance can. Tredwell through another maiden.