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It was a blocked bleed valve. Thanks for the advice. Next time I will try the easy things first instead of looking for big faults.

The tank is full. First rad went on OK but not this. I will take it off again and check the flow of water through it....cheers

It is a gravity fed system with an open tank.hot water cylinder and back boiler behind a gas fire.

I am trying to re-fit a rad after decorating and it is at lowest part of system as it has system bleed valve on one pipe. It only refills about a quarter of the rad and no hissing from bleed valve. I have turned off all other rads and tried turning on pump but nothing happens. It has a TRV on it...