Hi,
We stayed last year and have booked again for this year. There are w.c.s just outside of the car park only for people staying in the car park, very clean with hot water. Bus takes you from site direct to NEC, Marquee on site with entertainment and cafe.
Ideal location for visiting the show. The car parks on the camp site side are not in general use for members of the public so you can forget you are in a car park and there is security at the entrance and on site.