I sincerley beleive that the monarchy are one of the best defenders against the rise of nationalism in Britain, not just in recent times but going back to the start of Elizabeth's reign.

There are plenty of examples throughout history of movements coming to power by adopting marches, uniforms, ralies, ceremonies, symbols etc and co-opting them to their cause and calling themselves 'true patriots'. But in Britain, that's almost exclusively the relm of the Royal Family, so it's effectively impossible for any political movement to offer any of that in any meaningful way, because it's not really possible to be 'more patriotic' than the actual royal family. So yeah, if you want to feel patriotic you wave a flag an watch the queen do something quite harmless, as opposed to march with a, potentially quite nasty, group of politicians.