Originally Posted by
corporate-wage-slave
Yes. There aren't any service fees for UuA, but yes do it via a Contact Centre if online shows a figure greater than £200 give or take a few quid. If it does quote approximately £200 then you are good to go. Also all you are checking for is full redemption availability online, in which case UuA from WTP will also be available to you so long as it is a BA ticket and no other complications. The UuA button in MMB is not one of the more reliable aspects of BA's systems.
I have in the past did a few UuA from W to C and C to F from LHR to both JFK and SFO. And I cannot remember to have paid anything (or very small amounts) other than the extra Avios for the upgrade. Last time I did this was in April from C to F between LHR-PHL. Could it be because I start in OSL and not from LHR that I do not need to pay extra taxes?