On Jan 28, 5:43 pm, (Nick Maclaren) wrote:
In article Probably. A quick Web search indicated that their composition and even
shape are specified in a Statutory Instrument (albeit very approximately.)
18B in:

http://www.opsi.gov.uk/SI/si1997/19972658.htm

The mind boggles.

Regards,
Nick Maclaren.

Thanks Nick, it seems there are statutes for everything these days!

JudithL