This question has come up before. For 19 years I lived 5-10 minutes drive from G/CE-005 and have activated there on HF, 2m and 23cm many times.
I always operated in the field with the trig point which is a ~15 min walk from the massive C.P. at the visitor centre. One can hang the far end of an inverted-L to some of the lower branches of the mature trees on the west side of the field. There’s loads of space (not overlapping the public footpath) for a 160m dipole should you be inclined.
When I posted the reply below, somebody came back and said a farmer has objected to them. I never had that problem.