I have a nice upgrade for an upcoming 5 nights at IC Barcelona, Classic Room -> 1 Bed Suite Balcony Club Lounge (I have lounge pass - although I agree with others they should have separate categories for upgrades without lounge access - not everyone reads the full T&C). Booked Member Best Flex rate. UK Diamond Line was answered immediately and processed in about 5 minutes.

Our additional first two nights were booked using the AMB Bogof voucher, classic room. I booked this ages ago when e-standby upgrades still seemed to be a thing (they seem to be gone on the latest website upgrade) and have a confirmed upgrade showing in the app (and confirmed via email) to the same room type for €50 total (seems a bargain for 2 night upgrade) - they have may have given this free, but happy to pay for it.