There's a good reason why Sunland Leisure Park is cheap.
We were prepared to put up with the dodgy facilities and unprofessional staff for the price, but we ended up leaving 2 days early (and were refused a refund) because we realised we were not safe on the premises.
The park is often raided by locals from the housing project next door - we had our campervan broken into one night, and on another night we caught a man looking through the window of our van at 4am; when we confronted him, he spent the next 2 hours banging on the windows & harassing us to let him in so he could have sex with my girlfriend. We reported this to reception, who said it wasn't their problem because we didn't call security. They refused to let us speak with the manager or give any refund when we said we wanted to cancel the next 2 nights.More