People watch a lot of American TV. Some words are being adopted more commonly, particularly by the younger generation. I think movies is one of the more noticeable. I think it can also come down to TV companies sometimes. For a long time sky cinema was called sky movies. It makes sense, therefore, that those watching would call what they were watching movies and not films.
I got caught out by an American puzzle that used 'silent films' where I would have expected the US term to be 'silent movies'. So I guess films were known as films at some point in the past in the US.
We've been multicultural for most of my lifetime and for most of that time we went to cinema's to see films, rather than movie theatres or to the movies.
I Wales as in many other parts of the UK, Mum's are Mam's, I think Mum is a southern English thing.
We watched a series or a program on the telly, rather than a show too.
I think a lot of it is because of computers having spelling checkers who's default is American English as opposed to UK and people ether don't bother to to change it when the get a new device, or get fed up of keep having to change it every time it upgrades itself.
