I’ve fallen in love with Grammarly, an app extension of Google Chrome but also available in Windows. It seems to work really well and monitors your use of grammar and spelling, even on those websites which don’t normally spell check for you. (Something I have found to be essential in recent years). On initial set-up, you advise it to use either UK English or the USA English dictionary, alleviating a source of irritation that most spell checkers present to UK writers.
The added bonus is that it checks the grammar too, so the occasional incorrect word use is highlighted immediately. In effect, it’s doing a form of first line proofreading for you.
It’s available to use in its free version but enhanced features are added if you subscribe to the Premium, where it monitors many more areas of your text including sentence structure and writing style issues.
Have a look at the website https://app.grammarly.com/
I think you may like it too (No I’m not on commission)