FYI -

Zero Clips Ltd., in Brum, were very helpful, and even gave me some free samples. So I've got 1 exhaust clamp, at least!

Their website :- www.hoseclips.com.

I went for some more P-clips, which look exactly same as those on sale at Donnie. Brake pipe size - 8p each; fuel line size - 9.4p each. Catch is, min order £10. (Unless you call in person).