IMHO a profitable GA-only airfield which is in a good well maintained condition is impossible to do in the UK.
The business is too thin and pilots are on the whole too tight.
The only way would be a full-planning job, for a small group of owner-pilots, with limited movements (say a few hundred per year) with the prime objective being to achieve security of runway and hangarage.
What are the rules for getting avgas delivered? I read somewhere only licensed airfields can get avgas deliveries - is this true??