In article , Mike Barnard
writes
On Tue, 05 Oct 2004 16:26:08 +0100, Mike Barnard
wrote:

Thanks for the answers folks.

Sorry this is a bit late Mike, have a look at this, 35quid + vat + post, and it
may sing like your other solution, but it claims to do exactly what you're
after: Water pressure qualising valve, item 2 on page:
http://www.bes.ltd.uk/products/110.asp
--
fred