The housemates have spent their evening swimming back and forth in the small house pool for their latest task.

"It's not about stamina," explained Billi. "We've got 15 people. Jump in, do ten, we can all do one hundred in fifteen minutes; doing ten like that should take you about sixty seconds."

Some housemates chipped in readily, swimming hundreds of short lengths in one go, such as Jonathan who did over 500.

Others like Chanelle, meanwhile, sat inside and refused to do much, instead moaning about the "freezing" temperatures in the garden.