Does anyone know when
the next flash sale is? Or any ideas which month they usually have them?
On the UK site you now have early booking offer with 4 nights for the price of 2.
Other sites don't have spring summer or winter 2015 sales yet, not all of them at least. Sales should open next week. I read that one site with sales already available had a 30% off (i think it was finish site). So maybe that's what's going to open the other sites.
The UK has 15% off with free half board if booked before 2nd December.