Which anthems will be missed? For me, I will not miss 'God Save The Queen' - it needs to be replaced by something specific for England and not 'Jerusalem' either. Similarly, 'Flower of Scotland' is more of a dirge than something that rouses the spirits - so good riddance. Ireland's anthem doesn't inspire a great deal - I much prefer the crowd's choice of 'Fields of Athlone'. The Welsh anthem is fine - although again, Bread of Heaven' appears to be more popular during the game. For me, the only anthem I really enjoy listening to is the French - it's catchy, jaunty and in the range that I could sing along to, if I knew the words.
So what I'm proposing is that England use the same tune as the Marseillaise but with different words. I'm sure that would go down well with the French nation and help build a d'accord with them. You never know, they might even allow us to keep a bit more of our own money instead of supporting their antiquated farming system.