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thanks for comments. Seems like accurate diagnosis. not sure how to locate where the feed pipe meets the rest of the system. GUess will have to get plumber if pipe needs replacing. Some air sometimes comes out of top rads. One heats up fine, the others just gurgle. Havent tried...

We recently (xmas) had pump replaced and boiler descaled, and after that all rads were working beautifully. Yesterday the system seems to have come to a halt - only the first two rads in the system are hot, and then only at the bottoms. We have bled everything, but no air or water comes out of...