Michael Vaughan
Ex-England captain on BBC Test Match Special

"I've been so impressed with BJ Watling. He looks a real quality cricketer who reads situations really quickly."

Image source, Getty Images

Having served as the "Boundary Fox" last over, Mark Wood is pressed back into service to bowl, hoping to add to his two scalps earlier in the innings. Watling is looking every inch the specialist Test batsman, having sub-contracted wicketkeeping duties to Ronchi for this Test, and he calmly adds a single to his score.

Bryan Waddle
BBC Test Match Special

"Watling is a quiet achiever. He may well be worth his place as a number six batsman if New Zealand were to want to continue to use Ronchi as the wicketkeeper."

Margaret Ford: It's a public holiday today in New Zealand for the Queen's birthday. Was at Lord's on Monday! Great cricket!

The New Zealand lead inexorably moves past 250 as McCullum guides Moeen for three to Mark Wood, who's patrolling the cover boundary. He has 53, while Watling is streets ahead on 61 - but their strike rate is virtually identical.

Jonathan Agnew
BBC Test Match Special

"It was a chance, Wood just didn't get hands to it. England have dropped too many catches. McCullum has really played the supporting role for Watling, which is ominous for England."

Andrew Samson
BBC Test Match Special statistician

"McCullum has now passed 6,000 Test runs. He's only the second New Zealander to reach the mark, after Stephen Fleming.

"The last five times he's made 50 in Test cricket, he's gone on to get a century - two of them were double and one a triple."

Was that a chance? McCullum clubs Root just wide of the diving Mark Wood at mid-off for four, that takes him past 6,000 Test runs, while a single brings up his 29th Test fifty from 79 balls.

He's 1,169 runs behind Stephen Fleming who is New Zealand's all-time top scorer with 7,172. Making up the top five are Martin Crowe, John Wright and Ross Taylor.

Stephan Shemilt
BBC Sport at Headingley

"Even when the sun is out, it's very, very cold in Leeds. Umpire Rod Tucker stands at square leg, hands in the pockets of his white coat, running on the spot. If he's chilly now, we might have to thaw him out at 7.30."

A smattering of applause as Watling flicks a single off his legs to bring up the century stand from 150 balls. Remember, with the first-innings totals level, the lead is 242, so England are already facing a large fourth-innings chase - with more than two days of the match remaining.

Michael Vaughan
Ex-England captain on BBC Test Match Special

"This has been a brilliant partnership. They've played the gears beautifully. McCullum and Watling realised when the lead was 140 they had to be circumspect, but in the last half an hour they've really gone up a gear and targeted Moeen Ali. It's been very clever batting and it's got the feel of a match-winning partnership."

Image source, AFP/GETTY

Root, on paper the junior spinner of these two off-tweakers, is bowling with a shade more control than Moeen, but New Zealand are picking singles and twos up at will.

Jonathan Agnew
BBC Test Match Special

"Moeen's into his 10th over and he hasn't bowled a maiden yet. Bottling an end up is such a key part of what a spinner is trying to do."

New Zealand again look to make hay against Moeen, McCullum smacking the bearded off-spinner for four through mid-wicket. Watling gives a very, very tough chance to keeper Jos Buttler as the ball flies through, takes the edge and come off his gloves - while Watling shows he can clear the ropes with a slog-swept six.

Image source, PA

Kent batsman Joe Denly: Note to self: DO NOT DROP CHRIS GAYLE ON 40!!!!!!

Gayle went on to hit an unbeaten 151 off 62 balls for Somerset, but Kent clung on to win by three runs in a thrilling T20 Blast match in Taunton.

Graeme Swann
Ex-England spinner on BBC Test Match Special

"This is really poor batting. If a guy is coming round the wicket, he's trying to get you out sweeping - just play with a straight bat."

Image source, Getty Images

Was that England's chance? Another sweep, this time an orthodox sweep from Watling, but again the umpire shakes his head.

Jonathan Agnew
BBC Test Match Special

"Alastair Cook is trying to find a combination just to get some sort of control here, because New Zealand are scoring at such a rate."

In fact, Hotspot shows the ball flicking the bottom of McCullum's glove, and he survives. England must do without any reviews for the next 29.5 overs.

Graeme Swann
Ex-England spinner on BBC Test Match Special

"The only thing that can save McCullum is if this hasn't straightened."