Match drawn - NZ win series 1-0
Broad takes wickets with first two balls of day five
Jack Leach takes his first Test wickets
NZ needed theoretical 382 to win
Latham 25, Taylor 6
England have four slips, a gully and a leg slip for Ross Taylor. And for good reason - Stuart Broad has got him out 10 times in Test matches.
Taylor gets the first boundary of the day though - driving through vacant mid-on to the fence.
Ooft! Broad gets one to nip off the seam and beat the outside edge. Maybe a touch of reverse swing there too.
Taylor the flicks off his pads for two.
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Mark Gidman: "I'll just watch the first over before bed". Stuart Broad takes two wickets - all-nighter it is then.
Trevor Hilton: Great start to the day's play when England take two wickets before the Barmy Army sing Jerusalem.
James Anderson starts round the wicket to Tom Latham, who has witnessed utter devastation at the non-striker's end so far today.
And Anderson starts with a no ball, giving New Zealand their first run of the day.
Anderson follows it with six tidy dot balls.
Andrew Samson
BBC Test Match Special statistician
It's the first time Kane Williamson's got a first-baller in Tests in his 116th innings.
No-one's ever taken a hat-trick with the first three balls of a day's play, but there was a game in 1936 when a team needed two wickets to win and did it with the first two balls of the day.
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Melissa Story: SO WORTH STAYING UP FOR !!
David Merson: You just couldn't make this up.
Target 382
Taylor fends off the rest of the over - a double wicket maiden by Broad. Simply magical.
And Kane Williamson already back in the hutch means England's chances of victory have vastly improved.
Graeme Swann
Ex-England spinner on BBC Test Match Special
The first ball was a rank half-volley, but the second was a beauty.
And breathe.
Stuart Broad goes full and Ross Taylor shuffles across to defend the ball into the leg side.
Still, what a manically brilliant start to this fifth day.
Here's Ross Taylor to face the hat-trick ball.
Five slips, every other man in a catching position around the bat.
Here we go...
Andrew Samson
BBC Test Match Special statistician
Nobody's ever taken three hat-tricks in their Test career. Broad's taken two.
Graeme Swann
Ex-England spinner on BBC Test Match Special
Is this going to be one of those Stuart Broad days? Williamson wanted to get bat on ball, credit to him for walking off as he didn't get a massive nick. I'm sure Ross Taylor will not have had his pads on a minute ago. Perfect start for England.
Williamson c Bairstow b Broad 0 (NZ 42-2)
OH MY DAYS! What an unbelievable start by Stuart Broad.
This one is a peach - lifting sharply from just back of a length, fired down the corridor of uncertainty and Kane Williamson fends at it, nicking behind for a golden duck.
A massive wicket, the Kiwi captain gone first ball.
Broad is on a hat-trick!
Image source, ReutersGraeme Swann
Ex-England spinner on BBC Test Match Special
It really was a slow, loopy half-volley, similar to the one Ben Stokes got out to yesterday. The Barmy Army haven't even had time to sing "Jerusalem" yet, which they normally do after the first ball.
Jonathan Agnew
BBC cricket correspondent on Test Match Special
What an extraordinary start! No-one out there can believe it.
Raval c Stoneman b Broad 17 (NZ 42-1)
Gone first ball!
Stuart Broad sends down a half volley on leg stump and Jeet Raval flicks it straight to Mark Stoneman at square leg.
What a bonus. It was a really loose delivery by Broad.
Broad and Anderson zipped several pearlers past Raval's outside edge last night and it's a ball like that that does for him in the end.
Image source, ReutersSo yes, the first ball of day five will be bowled momentarily.
It'll be Stuart Broad to Jeet Raval first up...
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Richard Stoker: Could they not have planned to start the day's play at 10am and delayed it 30 minutes if there was dew?
It's all down to the playing conditions which both sides agreed at the start of the series.
Graeme Swann
Ex-England spinner on BBC Test Match Special
Nearly every captain I had was convinced I needed an extra cover rather than a point. If you bowl a big half-volley you're going to get hit for four anyway. But if you have a point, leaving extra cover open might make him drive.
When you're a spinner, you have three or four "catching" fielders, the others are bluff and subterfuge. I didn't have a mid-off because I expected the batsman to be caught at mid-off - I had one because I didn't want to leave it open to get hit over the top.
England spinner Jack Leach on TMS: "It's a shame Rooty declared on me yesterday, I was going for my first Test hundred!"
Vic Marks
Ex-England spinner on BBC Test Match Special
It's not a bunsen burner, he's not going to take seven wickets, but if he can contribute to a victory today and take three or four, Leach has the chance to play in the Test side this summer, let alone when they go to Sri Lanka and West Indies. There's scope for him to play in England as the frontline spinner.