Hixon is still pretty clear from the air, so if Wombat hasn't managed to see anything, my vote is for Hednesford, approx location OS ref. SK 010 140. Ken Delve's book mentions it, and it was as previously stated, primarily No 6 School of Technical Training. Whilst there was, according to KD, 'a small grass landing area attached to the site', he doesn't record any significant activity there.
Someone must know a bit more!
RF