I would also add Sky as one of the biggest broadcasters, certainly by revenue. They are commercial pay TV with some advertising broadcasting on their own satel

I would also add Sky as one of the biggest broadcasters, certainly by revenue. They are commercial pay TV with some advertising broadcasting on their own satellite platform but with some of their channels also available on cable and terrestrial. Not everyone has the Sky channels. Yes BBC is fully public corporation of it's own unique type (Corporation by Royal Charter - I think). Largely license fee funded with the rest coming from its commercial arm selling content (mostly overseas) and also books, magazines and back catalogue content in the UK. Channel 4 is a normal company but government owned. Funded by ad revenue. ITV is mostly ad funded and fully commercial. It used to be a group of regional companies (a bit like US affiliates) but they have all merged to one big company.