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Apols it's taken me a while - I've been away. To address the points: "My first guess would be that you have a by-pass valve in the pipework somewhere that you opened too much during the draining & refilling process so that most of the hot water is now by-passing the radiators." - I...

I've started using my heating after the summer and the radiators are taking ages to heat-up (eg about an hour to get to 52 deg). I don’t have a baseline for comparison, but the boiler is probably 25 yrs old & small, so it’s never been quick. It had a good service in Sept & was declared in...