Originally Posted by
Sally4th
My last upgrade tax was January 22nd at LGW and that was the usual 25.00 GBP. Has it gone up since then?
Thanks to all for your replies. I've flown both coach and envoy many times, so my question is not the value of the upgrade although that is debatable

Yeah, I squeaked by before the increased fees went into effect. IIRC, it happened around Feb. 1. For bookings confirmed and paid for prior to that date, some airlines ate the increase on behalf of their customers, others forced the customers to pay up or not fly.
A dummy booking on the US site shows it as:
"Tax: United Kingdom Air Passengers Duty $159.17"
Have a great trip, and let us know if you end up with Envoy.
Sean