Originally Posted by
MrProtector
The issue with this is - Barclays Cabin Upgrade Vouchers can only be used for flights starting in the UK, whereas my Companion Voucher could be used for the return flight.
The cabin upgrade voucher can be used for a return flight from the UK in the same way as the companion voucher.
Are you perhaps booking tickets for two people?
NB Award availability is different for Amex and Barclays vouchers, so it is entirely possible that cancel and rebook may be the only option otherwise it could be used to game the system.