Nick Grimshaw takes over the hotseat in radio's biggest breakfast show on Monday when he replaces Chris Moyles on Radio 1.

The 28-year-old is already in training for the early mornings - having done a pilot show on Friday and getting up at 5.30am on Saturday and Sunday to make sure he does not miss his wake-up call at the start of the week.

He is expected to double the amount of music played on the landmark show and will present the programme on his own after station boss Ben Cooper said he wanted to move on from the "zoo" format of Moyles's show in which his production team played a large part.

Producers are keeping their cards close to their chest about what will be on the show, but it will feature an interview with teen pop star Justin Bieber.

Grimshaw, known for his posse of celebrity pals including Lily Allen, Alexa Chung, Miquita Oliver and Harry Styles from One Direction, was a surprise choice to many, with drivetime show host Greg James expected to be the next breakfast host.

The presenter, known to fans as "Grimmy", was raised in Royton, Oldham, and took his first steps as a broadcaster in student radio while at Liverpool University.

He worked at MTV and Channel 4 before co-hosting the BBC2 music show Sound with DJ Annie Mac, and his swift rise continued when he picked up a slot on Radio 1.

The last figures available showed an audience of 7.1 million tuning into the show, well below rival Chris Evans on Radio 2.