Help in understanding refund amount from a cancelled BA upgrade booking

[rtid]

Hi all

I booked a BA flight from LHR to BOM in CW. This was using a Barclaycard Upgrade Voucher. I flew the outbound, but had to cancel the return. I got 50% avios back, but only £5 of taxes. Does this seem right?

https://ibb.co/j3gHsTZ

[BA Flyer IHG Stayer]

Remember that taxes and fees aren’t always a straight 50-50 split

To get a better idea I’d do a couple of dummy one way bookings to see what that would come to.