Earls Colne - the spa and country club is next door.
L2K - several to choose from and including the world famous spa on the beach.
Both in walking distance, or very short taxi ride, or bikes at L2K.
Probably others closer. I find the best bet is to identify where you want to go and then hunt around for the nearest airfield - it is surprising you usually find somewhere close enough although rarely in walking distance as with these two suggestions.