If you fly from to and from an English airport to an Amber destination whose rules are applied England's or Wales , if you look on WAG site its not very clear ?

I note TUI has a £20 PCR test however Wales doesn't allow the TUI you have to pay £179 for the departure and arrival one .

I was trying to work out how Welsh folk would be managed if flying to and from say Bristol ?

And If you fly to an amber country do you take a test there as well ,could you be stuck or have to isolated say in Menorca ?