David, Lisa recall day in outside world

David and Lisa have recalled their day out in London wearing alien costumes.

As part of this week's futuristic shopping task, the two housemates went incognito on the streets of London dressed as aliens.

They travelled to different landmarks on an open-top bus, including Tower Bridge, St Paul's Cathedral and the Houses of Parliament, and asked tourists to take pictures of them.

"We’ve been round London!" David told stunned housemates on their return. "We've been round the palace, we've been everywhere!"

"You should see how busy London is," said Lisa. "Everything was busy, and the kids! It was the best task out of them all."

"Best task ever," commented Siavash.