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Thanks for your suggestions. I appear to have 90 degree bends in the plastic pipework and its there that the gravel, must be ferrous oxide, rather than sludge has gathered. Need to take up a floor or knock a wall down to get at it. Maybe an electric replacement heater would be both cheaper and...

hot water supply pipe to a radiator is absolutely blocked and no liquid will flow through it. Have checked that the valve at the radiator is not faulty. Supply pipe lies in a totally inaccessible area. mains pressure will not move the blockage. Is their some way I could apply suction or...