Usualy art, yes, although names would include Fosters, Carling, etc. and not (that I've seen) a couple of the names you mentioned.

I honestely do not know about UK "real larger" production but typically in a UK pub, where you will normally find one or more real ales, you will only find the mass produced lagers.

The only pub I use on a fairly regular basis that sells another type of lager is one in Norwich (20 odd miles from me) I go to for a session. That one as well as a selection of real ales which include a couple it brews also has a few Belgian lagers available. I must admit I have yet to try one of these but I am told they are excellent.