Although I'm sure there are closer sites to Ashurst, my vote is for Long Meadow. Just avoid driving through via Lyndhurst, traffic during peak times is appalling.
A day of all things motorhome and campervan. The show is held both in the main indoor arena and across the grounds. Catering, hot drinks and food options are available. Easy access to the site and free parking included. Win one of five pairs of day tickets