David, Adgestone is a very nice site, providing the weather is good.
This summer it was flooded out and many pitches ruined, hopefully will be ready for next year.
Access is as has been said, a very narrow lane, whichever way you approach it.
The original owners of Adgestone have just opened a brand new site near Ryde, on the main road, great access, quiet site, but then Tesco is only 2 mins down the road, Ryde 3 mins, and the other way, Sandown and Shanklin etc.