Reply To: Can BA merge bookings and apply upgrade voucher to return leg?

[NorthernLass]

Was this with Barclays vouchers?

Was the inbound unavailable when you booked the outbound?

Try HUACA.

Or another option would be to ask them to cancel your inbound and rebook it themselves (they might or might not know how to do this). Are you within the free 24 hour cancellation period?

Or – cancel everything and rebook from scratch with the 2 vouchers. If your travel is a long time out it’s very likely the seats will reappear.