V-Flyer

So I want to a do a one way upgrade from B class economy to upper class on my LHR to lax flight. How much would this cost in fees?

Ring Virgin, they will be able to tell you based on what taxes you have already paid.

It will cost you £ 60 for the additional APD PLUS the difference between the VS UC fuel surcharge and the Economy surcharge one way which is about £60 as well

Assuming of course there is availability in the UC G Bucket of course