When we went this time last yr they were trialling a few special perks but I think most of those were stopped again early Sep however they may re introduce them again
We got:
Seperate breakfast room with hot food as well - in Yacht club restaurant
Free hot and cold drinks (and a few nibbles (sweets) 12-6 (approx)
Free afternoon tea (drinks, cakes, fruit, sweets) 4-6 (approx)
Free towels at the pool
Seperate check in desk (when we arrived though this desk was busier than the others so no advantage)
Rooms all on same floor and closer to lifts
Coffee maker in room and I think there was meant to be a complimentary basket of coffee/tea etc but we gave up trying to get this
Off the top of my head I think thats it.
As far as I know they stopped the perks linked to the food and drink in the afternoon and seperate breakfast but as I said they may reintroduce them again this summer