....once had the embarrassment of riding on the tube in flying kit. We has delivered a Victor to St Athan for a major but the flight back to Maham was cancelled (Wx ,I think). In those days, if you were not picking up an aircraft post major, 'Lindholme Air' would send a Hastings to collect you or one of the Comm Sqns would send a Devon.
Anyway, we asked for MT but were refused and given railway warrants instead. So four of us in sweaty flying overalls and carrying all our kit boarded British Rail at Cardiff. We got some strange looks on the tube - people may have thought we were cleaners coming off shift.
....should have got a taxi for the cross London bit, but we knew we would never get our money back