I agree with the previously mentioned:
Nayland
Lundy
St Mary's to a lesser extent.
I should add:
Kersey (Suffolk) - rather short and sloping, but not as steeply as Nayland
Priory Farm - relatively short with a hangar at the Southerly end
Northrepps International circa 2000 - it moves from time to time, but the yr 2000 incarnation was short and sloping.
Bodmin - humped
Davidstow - very badly potholed
Roche - very short
Gweek International - very very short
Mendlesham / Mickfield narrow grass strip
Dennington - short
Needham - short
Lawford - very short
Milden / Harvest Farm - short
Belchamp Walter - short
Gt Cornard International - short, wires nearby
Somersham / Little Blakenham heliport - surrounded by HV cables and pylons