Reply To: Tier points using Credit Card voucher

[AL]

You earn TPs based on the original booking class, so you’ll be earning in Y.
Section 3.1.6 of the terms: https://help.virginatlantic.com/il/en/policies/terms-and-conditions/flying-club.html
You used to earn in the upgraded class (or, rather, you could ask…) but that’s now stopped.