Hi Jemma
I can fully recommend Haven sites, having spent several months on them over the past few years. I am currently on their Caistor site, which, like, Rockley Park, has a brand new toilet block and it is excellent. I spent June last year at Littlesea, which is on the other side of Weymouth, and it is a fabulous area, I'm sure that you will enjoy it.
Our grandchildren love the entertainments at Haven and they have some excellent cabarets and live music for adults.