combine
https://www.google.com/maps/d/viewer...135742202&z=10
(if you go to the little three dots in map legend you can download the respective .kml files for Google Earth)
with the LAAS list
http://www.laasdata.com/uploads/The-...ield-Guide.pdf
and get i.e.:
Frogland Cross-Grange Farm/Brickhouse Farm 51.5451 -2.5220
Saltford-Avon Lane 51.4102 -2.4491 (the one Jan mentioned)
Doynton-Rookery Farm (microlight only) 51.4734 -2.4030
High Littleton-Clutton Hill Farm 51.3415 -2.5225
...
You may have to start from there to find out which are open to not based A/C, but does not look that bad for microlights in the area.
If you go to Garston Farm 10 miles east, try Lord Nelson ->
http://www.lordnelsonatmarshfield.com and on approach be nice to Colerne MIL ;-).