"If there is a real emergency - for example a situation necessitating hospital treatment - Big Brother will judge each case on an individual basis to decide if the housemates may return to the House. If a hospital (or similar) visit is necessary a member of the production team will accompany the housemate to ensure that there is no (or minimal) contact with the outside world. If a hospital stay of longer than one day is required housemates may not be able to re-enter the house."
Form: http://www.channel4.com/bigbrother/rules.html
Form: http://www.channel4.com/bigbrother/rules.html