V-Flyer

Hi, does anyone know the approx cost of taxes and fees when upgrading a one way premium flight (LHR-JFK) to upper using points. Would it be less to the same than the taxes fees displayed for reward seats?

I believe all US flights are incurring a fixed £330 YQ fee each way for Premium to Upper. You may be lucky and it be less, but that’s what I’ve been paying for my US upgrades this year. Plus the points of course