For anyone planning to visit the site, be aware that it catches every breath of wind, ie it's cold! The path up to the site is fine for mobility scooters, but manual wheelchairs might find it steep. On the site there is limited access from the main path, but if the weather is good and the ground dry it is fairly flat and you can trundle around. Be aware of rabbit holes, I got a wheel stuck down one and it just span uselessly! disabled parking is right by the entrance to the car park and IIRC is free for blue badge holders.