Thanks for the explanation, Brian. Like Kevin, I've wondered why the National Coal Board had milk floats...
I have a cream NCB one in a similar state to Kevin's. If I ever get to repaint it, I'll go for the Job's Dairy transfers, as my grandmother in Twickenham got her milk from them.
Regarding Models of Yesteryear, the table of scales doesn't include some recent ones, including YSH1 Gypsy Caravan from 1993 and YSH2 London Omnibus (also horse-drawn) from 1995. Based on the figures on them, they appear to be 1/43-ish, though the gypsy caravan is possibly a little larger.
Gordon