Not entirely sure so I can't answer your question in full. I can however, share my experience of booking this September - I know all the cheap sites to book accomodation and where to get discounts and cashback, I use them so we can get the best price which in turn allows us more than one visit a year to Icmeler.
I trawled all my usual sites to find accomodation in September, and like many others am guilty of assuming
ICR are a bit pricey. That was completly wrong. The nearest price I could find (including cashback and discounts) was over a tenner more than I could book our accomodation through ICR.
I'll certainly be coming here first when I'm looking for our next holiday