The requirement for candidates to stay at a staff member's house if an exam is moved to the following day was removed in 2004 and yet it never dies on TSR.
If you have more than 6 hours of exams in a single day then you can opt to move one to the following day. If you do this then you and a responsible adult (generally a parent) have to sign to say you will not communicate with anyone outside your immediate family or go on line. The exam centre will keep your phone overnight. I've had this situation with many students over the years and I'd say this is the best bet if you have 7 hours or more but that most students find it quite unsettling and are better off doing them all in one day if it is 'only' just over 6 hours - but it is your choice. If you do choose to do all 3 in a day than the centre can claim special consideration for the final exam which will give you about 2% extra raw marks.
Talk to your exams officer to agree how best to sort this. How it will work best depends on exactly how long the individual exams are and what the total is but it may make sense to move one to the morning and then have a a late start in the afternoon - so say starting at 09:00, 11:20 and 14:00, finishing around 16:00 if you have 3, 2 hour exams.