In message , Spamlet
writes

Trust these devices if you must.
I don't have the luxury of being able to afford to.
Perhaps there are some people reading uk.d-i-y who aren't moneyed experts
and this information might save them some time and money.
If there are no non-rich-experts using this forum, and anyone else who takes
the time to offer up useful information is just going to be sniped at, what
is it for?

Ah, but if you'd looked here - in the uk.d-i-y FAQs

http://www.diyfaq.org.uk/plumbing/co...itionvalve.htm

The symptoms are well known to most regulars here, and a request would
prolly have brought a quick answer


p.s. it's a newsgroup, not a forum


--
geoff