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The radiators furthest from the boiler are both cold. Help?

The two radiators that are furthest from the boiler are both cold. One gets slightly warm but the other is just cold. They are both at the end of long spurs. I have a Valiant boiler. Any ideas as to what I can do?
David Hinds, December 2005
Cut the other radiators down on the lock shield valves to balance the heating circuit. Let me know hoe you get on by emailing me on aocplumbingandheating@btinternet.com

Joe, December 2005
turn off all other rads and see if the last ones get hot if so open the others up slightly

terry, December 2005