Gervais and Ulrika join Radio Live8

Ricky Gervais, Ulrika Jonsson and Johnny Vaughan are among the stars signed up to host radio coverage of this weekend's Live8 concert.

All major commercial stations will air the show throughout the day to an estimated total of 28 million listeners.

Coverage begins at 10am with Vaughan and Liza Tarbuck. Jonsson, Ronan Keating and Richard Bacon host from 2pm.

At 5pm, Cat Deeley and Patrick Kielty will take over. From 10pm Jamie Theakston will broadcast live from Philadelphia.