Originally Posted by
Lucanesque
...
Not sure I want to use my Avios to UuA, but will definitely try my luck with an AUP. Thinking about that, am I best to hold off OLCI and instead wait until I get to checkin and ask if there's space in the CW cabin for me to buy an upgrade? ...
I don't think it matters if you OLCI. At the First check-in in T5 the ticketing counters are (I believe) the ones to the far left and you need to ask them for an AUP, as the regular check-in desks cannot take ticketing payments.