Thanks to John Mead, who supplied an airfield diagram from an obsolete
Lockyears, I've finallyf found the correct location.
If you still want Branscombe, go to the download link, below. Move all the .bgl files to the FarmStrip Scenery folder, where you placed my first version. Allow the files to overwrite the earlier versions. This field's a bit easier, provide you don't drift onto the downhill side of the runway. If you can find it, enjoy it.