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22mm dropping to 15mm just before first radiator everything after is 15mm. They have insulated the new pipework (22mm) very well so like you said minimal heat loss probably not worth all the trouble changing the run. Thank you for the replies

My Boiler is in the loft so I have at least 15 metres of pipework to my first radiator. How Boiler used to be in the Fireplace nearer the first radiator but now it's in the loft so they ran the pipework across the loft down the integral Garage wall under the floorboards and connected to the...