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Isolating valves do have a smaller bore and do reduce flow rate. As do the flexi hoses that are now commonly connected to bath and basin taps. Solution... Change the isolating valves for *** ( water or gas) fittings as they are the full 15 or 22mm bore.

This sounds like some cowboy installed the system. I bet that the bathroom rad is on the hot water circuit from the boiler to the hot water cylinder and not the heating circuit ( quite common as people want the bathroom rad to come to dry towels if the heating is off but water is on). Instead of...

Hi. This is Paul, Im a plumber. This sounds very much like you have an air lock in the flow or return circuit pipes before this rad. Solution. Close of all radiator valves on all radiators that are on that floor and run the heating as usual. After a while the rad will become hot. Bleed as...