La Toya, Mutya practise 'Big' tune

La Toya and Mutya have been practising their performance of 'Heart and Soul' on a giant piano for their challenge in the toy task.

Still dressed as a toy soldier and rag-doll respectively, the pair have to play the piece with their feet without any errors to succeed.

Both had expressed concerns that they would be unable to perform a second tune and discussed how they "bartered" with Big Brother to allow them to perfect just the single piece.

The duo have spent much of the day rehearsing in a special music room, with La Toya tapping out the bass notes and Mutya playing the lead in an imitation of a scene in the Tom Hanks' film Big.

"That was good," La Toya said, after one run-through.

"Getting better," Mutya replied, "but my ankle's hurting".