Originally Posted by
KARFA
you need to look at a booking which matches your own. so if you booked a return you need to look at a return to get an accurate idea of the charges.
Update, availability came up and I was quoted £279.93 and 24k Avios to upgrade from WTP to CW for just the JFK-LHR leg of a INV-LHR-JFK-LHR-EDI booking. Seems very steep.