I've had BA-issued tickets with a higher face value than what I paid. In this case, I bought a LGW-BOD ticket during one of the co-sponsored deals with some U.K. newspaper but the ticket was booked and bought through a BA reservations centre. Costed me GBP 150 - ticketed value was GBP 250. I ended up not being able to go due to work reasons and got reimbursed GBP 250.