Hi ILH, we've always stayed in a static aswell. Couple of tips: if you are staying in one without central heating take a small fan heater with you as the bedrooms do get cold at night even in summer (as I'm sure you know). Also, only the 'Premium' range are provided with duvets, the others have blankets so depending on what type of van you're in you may want to take one with you. That said though we've never bothered but the heater was definately needed when we went at Easter last year.
Fingers crossed for the weather then! We've often found that if it's cloudy/rainy where we are in Cornwall if you drive a bit further along the coast or across to the opposite one you'll find some sun.
Oh, and watch our for the seagulls...they're enormous