Rodo, I used to be with BTYahoo which then became BT internet.
Master O downloaded an ad-blocker (AdBlock) for me and they do seem to work. It seems to block advertising videos as well. You can set it to allow ads on some sites and not others, but I have it unrestricted and I don't tend to get any ads at all these days (except on Microsoft's own embedded ones on W10 sites).
They are "controversial" in the sense that people like the Guardian don't like you using them, as they are getting no advertising revenue money from their website, (but that's the Guardian's problem, in my book), and some websites like the Birmingham Evening Mail do not let you view any articles on their pages at all (but they are a left-wing rag and tend to leave me foaming with rage anyway, so that's no great loss
)
I'm sure Suff or WM will be along to give better advice than me, though ....