Then you have a kindered spirit in me my old coracle.
I have no axe to grind with the Welsh, i actually think your Anthem to be amongst the most stirring in the World. The fact that i picked out Rob Howley's( the greyhound) side singing,( which has been on my favourites for a lot of years now, should give you a clue).
However, i do not agree that it should be sung along side ours at the FA cup final, for reasons given.It is a club competition, not a national one. It is the FA not the FAW or SFA and as such, their rules apply.