Originally Posted by
KARFA
you pay the same extra taxes/fees/charges that you would do if applying the GUF with ba directly. Having said that a LHR-LAS rtn should have the same taxes/fees/charges in CW and F so you should have to pay much if anything for that upgrade. Where are you seeing higher TFC in F?
On the return leg, using the Rewards Calculator on BA site, CW is £449.40 and first is £603.92.