Paul Ruskin has pulled together a set of cup files of UK Airports and landable strips and fields, together with current radio frequencies which he intends to update roughly monthly.
There are three main files:
UK Airports <date>.cup
UK outlandings <date>.cup
UKN Airports and outlandings <date>.cup (a rather sparse set about 55N – additions welcome)
A version with airfield codes as the first part of the name is also included. In each case there is a corresponding .kml file which can be opened in Google Earth, so you can look at the field.
These are complementary to the BGA TP list (so you won’t have two waypoints in one place) when you have that loaded.
Usual caveats apply: Use at your own risk, check the data if it’s important to you. The farm strips especially come with no guarantee about width, crops, surface or animals, albeit all those included are thought to be at least 25m wide (via inspection by Google earth only).
If you use them please send Paul an email (email@example.com) and he’ll add your name to the list of people to be notified of changes. If you find mistakes or omissions, please let him know.
You can download the files from here: https://tinyurl.com/UKairfields