N.I. is part of the U.K. therefore Her Maj is currently the Queen thereof. It's not part of Britain, so he's not British.
The only thing I know about Brighton besides being on the seaside is that it's where the mods had gay sex with the rockers on the beach in the 50's or 60's. I think I'm remembering history right.
And what? Lizzie is the reigning monarch of Britain and NI, if she ain't you'd better tell the peeps on the likes of the Shankhill Road that they've wasted their lives serving a foreign Royal dynasty.