This is a very important question, and I am glad someone has raised it. I am sitting at home all day these days by myself writing (and because apparently I am unemployable) and deciding when to have lunch is critical.
I go for 1pm, but the only thing on telly then is Oprah (can't stand her and her self-promoting ways), crap made-for-TV midday movie (vomit), The Days of Our Lives (yawn), and Question Time in Parliament (yawn and vomit). Fridays I hold out until 1.30pm for the Men Behaving Badly reruns.
I think it is all about making the afternoon as short as possible, so the later the better. Very important decisions though, DJW.