I'm sorry, but a UK Airpark is doomed to failure.
Planning - Anywhere there's a big-enough chunk of land, that's cheap -enough to make both airfield AND house-costs stack-up, is
1 - going to be where insufficient numbers of Aviators are prepared to live
2 -going to be vetoed by a Local Authority who, on any non-greenbelt site, will be looking to maximise the rate-revenue and minimise the liabilities.
what makes you think they'd be happy with low-density, lots of Tarmac and streetlights,drainage, noise-complaints /monitoring. pressure on upgrade to local fire-service.....etc.
Alternatively, once a site is earmarked for development, cram as many breeding-boxes in to it, at as high a rate-revenue per unit as they can get ,plus invariably get the developer to cough a goodly chunk or all the cost of roads, sewers etc. which the Authority only adopt when the cash-stream is flowing.
Sorry, the pilot-count in UK is too low, the land-value too high...and most Microlight and LAA types would not afford or be willing to live in the back of beyond where the figures just MIGHT stack.
* Dons flame-resistant overalls and ducks *