Yep, central TV distribution amps. are becoming more common here as more people want their satellite/VCR/DVD outputs available all round the house. We've yet to see many of the big "home theatre" setups that are becoming more popular in the States though. For most folk the cost of these monsters at U.K. prices is just way too much, plus the fact that basements for conversion are rare here.
Telephones are one aspect of electronics & communications I find fascinating, especially the older developments & equipment. My first job on leaving school was actually with British Telecom at a satellite station handling overseas TV/telephone/telex.
Anyone interested in this sort of thing might like to have a look here: http://www.light-straw.co.uk/ate
(Includes one section on power for exchanges.)