JabberWokker wroteMany years ago for a far off operating system called Windows 3.0 onwards I wrote an app to spell check anytime, everywhere, any program(me) as I was bugged by the same problem and the lack of spell checkers. The programs that did had one, were based on someone that could already spell quite good, so mine was quite impressive and yes real UK English all the time by default and US as well. Didn't do bad either.
Today my advice is if you are having this problem with this forum you then have also got it elsewhere, so the solution is to just buy a Mac, it's all there. I hated them and love them now after over a decade with the old windows. Can't knock it until u tried it.
You may have a spell checker, but now you need a grammar checker.:icon_mrgreen: