On Saturday, I was travelling on an XC train from Reading to Birmingham. It was busy at Reading and had standing passengers from Oxford. At Reading, I found a table seat, unoccupied but marked 'reserved Bournemouth to Birmingham New Street'. I checked with the guy in the next seat and it was vacant so I took it. At Banbury, more passengers boarded. One approached an existing passenger in an airline seat, and asked for it, as they had it reserved from Banbury. Bumped passenger vacated the airline seat, and asked me to move, as they had reserved the seat I was in from Bournemouth. I did move to stand, but should I have done? Part of me says that if someone asks for a seat it's polite to give it to them. But another part says that if you have a reservation and you choose not to use it at the outset, then you've given up your right to it. Any thoughts?