On Thu, 30 Jul 2009 13:13:37 +0100, Tim S wrote:

I would ask the water company what they require.


I was just told "any one that meets the cold water supply regulations"
and a link to the OPSI web site. Unfortunately that does not go into
detail about classes, so I am waiting for elaboration from the water
co.

Otherwise, here's a cheap one from a respectable supplier:

http://www.bes.co.uk/Water-Meters-_2...2009_7_30.html

That's the one I saw, which started this particular ball rolling.

Thanks.