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Thanks for all your suggestions. We are going to remove rads this weekend and see if flushing them out helps. Pressure of boiler is ok, checked regularly, and is fine when both cold and hot. We will aso check pump chamber. All rads are hot, no cold spots and domestic water is fine too. Thanks...

New condensing boiler (Ideal Isar HE30) fitted last year and have suffered since with noisy radiators- sounds like small bits of gravel inside rads. This only occurs in the upstairs rads. System flushed and drained several times, inhibitor added, new two way valves fitted, bypass valve fitted...