'Mel and Sue's Bake Off may well be OK'

Mary Berry, Mel Giedroyc and Sue Perkins won't be following the Great British Bake Off to Channel 4.

With all three stars saying they want to stay with the BBC, could they make a programme that looked and sounded like the original?

Piers Strickland is a lawyer and intellectual property expert. He told PM's Eddie Mair that it is not as black and white as you may think.