@McTag,
McTag wrote:I think also that the use of the word "client" presupposes a commercial transaction of some kind.
I wouldn't say so. Not always, anyhow. Social workers have clients. A PC way of not saying someone is a "nutter" is to say they are, or have been, a "client of the mental health services", or rather than "junkie", "addiction services client". Often you see "service user" as well.