When a train arrives and there are murmurous people more than seat available getting on, why don't people move the bags off the seats, why wait to be asked...
The British temperament is to say sorry for the seat we have paid for and the inconvenience of the person being a cf in the first place with bags on seats.
It's really annoying that we apologise when I want to say in a pa voice" oh did you pay for two seats?"