TMM - Kidlington (or London Oxford International Spaceport etc. etc.) isn't that exclusive to light GA. Pilot Flight Training (PFT) have remained fit and healthy for all these years still with eight or nine aircraft based there and it's still only £10 to land at the weekends for visitors or free with a fuel uplift over 45 litres. The published rates for residency at £125/month including 10 landings/month is about as cheap as it gets for an IFR airport anywhere in the SE UK - and its usable from 06:30 to 22:30 all year, every day.
With most of the Oxford Training VFR traffic gone now, it's only seeing about 50 landngs a day, so hardly the same madly busy environment it once was.