Would endorse those recommendations for nice grass runways - Panshanger, Compton Abbas, Old Sarum all nice (though the latter has quite a hump in the middle - looks alarmingly short when you line up on 08!) and all three have nice cafes, too.
Also recommend Goodwood (Chichester) where your arrival on grass is always greeted by a courteous 'Welcome to Goodwood' over the radio. I've not yet bounced there so I don't know if you get repeated 'Welcome...' for each bounce...
Tim