Thanks again, I will contact the nutters at Lewknor (skydiving - no thanks!) and see what's possible.
Some of the more obscure fields are actually great for GA - I frequently land at Tibbenham in Norfolk which is operated by the Norfolk gliding club and has massive ex WW2 runways with excellent surfaces, you can even get fuel there if you have to. No landing fees and a good spot to visit - albeit you need your head on a swivel and have to work out airfield information for yourself on arrival (no-one seems to ever man the radio).
- A.