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Sadiq Khan is one of the great survivors of British politics.

Someone whose political career spans back to the Blair and Brown governments, who's waxed and waned in the Labour Party since and national politics since,

but who has a big presence on the national political scene for the last two decades.

Someone who can boast Donald Trump as an adversary,

one of the most senior elected Labour office holders in the country. A seat at the top table,

a chance to work with and observe prime ministers up close. Twice elected mayor of London,

he's standing again next year, hoping to do what those other titans of the political stage.

Ken Livingston and Boris Johnson could or would not secure a third term. Yet unlike those

two politicians of such primary colours, Kahn's political palette has been softer, less distinct.

In many ways, he's a man who remains elusive. The last time he was with us just a few weeks ago,

it was for a briefish news interview about the police and the Met.

So as he publishes a new book, outlining his new great passion, environmentalism and the fight against air pollution,

we thought what better moment to try and understand this man better, and so invited him into the newsagent studio for an extended conversation about his political journey.

The Muslim South London lad, son of a bus driver, to one of the highest offices in the land.

And it matters far beyond London, because this is a man who is starting to construct a very different model of political progressive leadership than that of his party leader.

He's a man who is starting to take risks.

It's Lewis here. Welcome to the newsagents.

The Newsagents.

Mattadie Kahn, welcome back to the newsagent.

You can't keep you away.

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