BBC NEWS | Entertainment | John Cleese writing Aardman film: "'It will be great comedy adventure about a pre-historic culture clash between two tribes, one comparatively evolved tribe, and one un-evolved tribe,' he said.

'Some might consider one tribe might be the English, and some might consider that the other to be the French, the Gauls.

'Let's just say it's the start of the Entente Cordial and it explains why the English Channel is there.'"