extra costs when upgrading using GUF 2
i am looking at flights for Xmas from KUL to MAN (via LHR) buying PE and upgrading to CW using a GUF2
The price without a GUF2 is £2230 (Booking into T and K Class) but when buying the upgrade together the price rises to £2790 , is this just extra Tax?
The booking is for 2 adults and 1 infant.
I know there is a difference but i wasn't aware it was that much