Just an observation, but I usually travel on one of the less busy EC services from GLC and there always seems to be a fair proportion of "no shows" for reserved seats, at least to about NCL.
Now a question - is it the accepted practice that:
if the holder of the reservation does not appear within a few minutes after the train has departed the "from" station named on the seat reservation, then it is permissible to assume the seat is no longer reserved for that part of the journey?
Or is that still an offence?
Obviously if they appear later on (having boarded at the wrong end of the train for example) you would have to move.
Perhaps it would be safer to check with the guard/TM?
Theres no need to go through all that palava - just sit in one of the many unreserved seats anywhere on the Train. This applies to East Coast or Virgin.
As most people do a "pavlov" and sit in their allocated seat "without a bell ringing" you will have a wide choice
Peace will be with you, and you will have no trouble !!!