Just posted a little fieldnote tsc. Yes, access all the year round I should think although the Lodge itself is only open from 16th March until 4th November, Fri-Sunday (and BH). The telephone number is 01451 844130 if you want to check.

Also visited Greystones Farm Nature Reserve and followed the Archaeology Trail - not an awful lot to see but very interesting information boards giving info on a geophysical survey which revealed evidence of a Neolithic causewayed enclosure and the later hillfort.