I wouold have thought for excat declines one would have to look at the airport visitor numbers. If they are still up against last year, then the visitors arent going to the hotels but probably to friends, families or acquaintences apartment.
Also each tourist place has a cycle and if the newer investors are buying in other countries, they will be going there too.
I bet Bulgarias rather full this year with their completions! As will be Turkey, Italy the new place and other far off fields.
The rest of the brits cant afford it due to xmas overspend and the credit card companies cancelling their accounts!