Robert Peston has bagged his biggest guest yet for his new ITV politics show Peston on Sunday: prime minister David Cameron.

The PM is set to make an appearance on this Sunday's show from 10am, in just the third episode of the new format.

Peston's show has attempted to differentiate from its BBC rival The Andrew Marr Show by encouraging a more relaxed interview style. The Chancellor George Osbourne appeared without a tie in the opening episode, although week two guest Nigel Farage did not follow the ITV 'dress code'.

Labour leader Jeremy Corbyn also appeared on the ITV show last week, with ratings doubling after a slow start.

Cameron will join former Labour shadow chancellor Ed Balls, former Tory MP Esther McVey, singer Lily Allen and comedian David Baddiel.

The ITV show's Twitter feed first confirmed that Cameron would be appearing this Sunday, although host Peston added that he was taking "nothing for granted".

Meanwhile, there remains doubts as to whether Cameron will appear on any of the BBC's live EU referendum debates: the PM has agreed to a Countryfile interview, but is yet to confirm whether he will feature in any of the BBC's live referendum programming.

Peston on Sunday airs Sundays on ITV at 10am.