Hi WWW sorry to hear of your plight, but when I was learning to fly I had to divert to Sleap because of WX.
The owner of the aircraft (known to both of us) not only praised the action but came by road to collect the instructor and myself, all without a moan.
In fact he praised the enlightend and prompt action, thats why we are still very good friends and I use his aircraft.
So all the best I am sure there must be a Welsh way of dealing with this tight fisted penny pinching prat, I do know him so I can relate to your situation.
All the best
PA38