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So, today I drained down and refilled the system, adding inhibitor and bleeding the rads as I went. The system fired up OK, and didn't bang like it had been, at least the first time it fired it didn't! Once the system had been off for a couple of hours I fired it up and got the same noise...

JonCa - Thanks for the advice, really appreciate it. I put central heating cleaning fluid in the F&E tank last week so will need to drain it down tomorrow. Presumably it's best to wait until after I've done this before messing about with the rads? And/or is there anything I should be mindful...

I'm bleeding the radiators (usually the same one or two) daily, a small amount of air is released, but the noise continues and the air builds up day after day.

Shortly after my central heating kicks in there's a loud thumping sound coming from the pipes. The sound moves around relatively quickly but generally comes from the run of pipes between the boiler and the pump. Occasionally it's accompanied by a gurgling sound, and the pump sounds as if there...