Owning your own home

Ha, this was hidden in the T&Cs:

If we don’t sell enough tickets.
After fees and operating costs, the remaining money will be split 50/50 between charity and a cash prize pool.

If the number of fully paid entries to the Competition at the Closing Date is less than 200,000 fully paid entries, the Competition will close and the total proceeds of the Competition Entry Fees received by the Promoter will, at the sole discretion of the Promoter:

At £5 a ticket that's £1m. Seems fairly much no lose for the house-owner and the charity.