I can guarantee that all announcements will have to return to being in both English and Welsh as part of the law in Wales that everything must be in both languages. A pain in the hole I know but it's the way they want to do things. Though I do know many people have complained to station staff at the main stations about announcments in Welsh first taking so long people have missed trains
Correct that many things are legally required to be in both English and Welsh. Although as far as I'm aware there is no order of precedence attached to the two languages. So it should be perfectly acceptable to play the English announcement first, followed by the Welsh. After all, if it was "legal" for the annoucements to be ordered this way over the Ryder Cup, I assume it's still legal. And in certain locations in Wales, where Welsh is not generally spoken as the first language, it would make much more sense.