The BBC website has a bunch of stats on what an average UK family is like. There’s a lot there, too much to summarise, so read it for yourself.
Some points of interest: 40% have two cars, one of which is likely to be a Ford Focus, 79% have a mobile phone, and 65% have a home computer.
I’m surprised that 35% of UK families don’t have a home computer, since nowadays people seem to expect you to have the Internet (I remember how irritating it was before we got broadband – teachers kept setting homework that required me to be on the Internet for extended periods of time. It was a nightmare).