Thanks again @Dolor, all I was saying is boiler is priority but will look at radiators in conjunction with the plumber when I get there, I had a repair to my boiler and a radiator reconnected a few months back and I believe they power flushed the system then.
I had 18 radiators power flushed through on a 20 year old system and it took them nearly a day and cost me £14 in water charges. Six months on from the boiler change, the filter showed no sign of debris.
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