Originally Posted by
zaphod424
You'll have to pay the reward flight cancellation fee of £35pp, which will be deducted from the refund of the cash portion of the booking. If the cash amount is less than £35pp then they will just keep all the cash but you won't have to pay any more and will still get all the avios and voucher back.
This makes me think my recent Y-only voucher open jaw booking to Europe may have been even better value than I thought. Due to being open-jaw I called up with pre-identified flights and a very efficient agent booked it within ~10 mins including checking all Avios had been taken "because if they don't go through now it can cause problems later". Expected a £15 call-in fee, but only charges I can see on AmEx are the £1 each not-taxes fee. So if we cancel it will only have cost £2.