On Tue, 27 May 2008 21:10:16 +0100, Mike Dodd wrote:

As always, any help gratefully received.

Have you looked at
http://wiki.diyfaq.org.uk/index.php?... sure_dropping

(or if that wraps on your newsreader go to
http://wiki.diyfaq.org.uk/index.php?...Heating_Repair and
navigate to the section "system_pressure_dropping")

--
John Stumbles

This sig intentionally left blank