We stayed there last year when we went on the Swift factory tour. As Dale has said, the caravans and tents were pitched up any old how, the toilet block was from the dark ages and the showers which were in a portakabin, were filthy.
Park resorts have spent a lot of money building their entertainment complex and swimming pool and its a pity that they didn't allocate funds for new shower blocks and toilets. The park caters for a lot of statics, so of course they don't need these ameneties.
In Park Resorts favour, we found the staff to be friendly and helpful and on price they were unbeatable.