I was telling someone on your forum ride on Saturday that I had once reserved a space on a train from Coventry to Leeds but found that the space was taken by an unreserved bike. The official on the train was not interested in enforcing the rules so I ended up securing my bike elsewhere with a bungee cord.
I went to my bike as we were pulling in to Leeds and spotted the owner of the unreserved bike retrieving his machine. It was then-regular forum member
@Calum, a student at Leeds who had been on many of my forum rides.
Calum is short so I tower over him. I crept up behind him, put my hand on his shoulder from behind, and in my deepest voice barked "EXCUSE ME, SIR - YOU DID NOT HAVE A RESERVATION FOR THAT BIKE!"
He almost had an involuntary bowel movement as he turned round, muttering excuses. Then he recognised me ...
Oh, and once (again coming back from Coventry) there was such overcrowding on a post-Christmas train that staff refused to let anyone board, bike or not, seat reservation or not.