Hi - I know of a very unusual grass helipad in the grounds of a Grade I listed house in Sussex. See
Hammerwood Helipad - Home and
Hammerwood Park - Wikipedia, the free encyclopedia for more details - landing fee only £20 and manned 24 hours. Highly recommend it. Apparently used to be owned by Led Zeppelin and was rescued by the present owner and his family! What a job to save it from such a state of delapidation...