My Jaguar 23kw boiler stopped producing h/w. An engineer came out to look at it, said it could be a load of different things and would probably cost in excess of £500 to fix. So looked on this site and everyone pointed to it being a problem with the daiphragm so took the plunge and took it out.....extremely happy to find yes the diaphragm had perished so got a new part for £10 put it all back together feeling very pleased only to find that the two bundy pipes into the value which use a o ring and spring clip mechanism leak. Tried everything to stop the leak but so far to no avail...am going to order new o rings (though they seem fine) and new clips - its a full on leak not just a drip, could new clips make all the difference?