Seems to me that a lot of national anthems are sectarian and/or god bothering crap about showing your arse to another nation. My vote would be to stop singing them but I suppose they will persist as long as patriotism is perceived as a good thing.

As for an English anthem, I agree with Billy Connoly's suggestion of adopting the theme from the Archers without words, just the dum-te-dum-te-dum-te-dum and an impassioned rum-te-tiddely rum-te-tum at the chorus. Easy to remember, inoffensive and jolly good fun.

And in answer to the original question (partly) Canada has two official anthems, O Canada and God Save the Queen.