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Thanks for this John, would this explain why there isn't hot water too. Funnily enough I've replaced about 6 rads here and never had a problem and the system was flushed through 2 years ago. I can only get a couple of yards down with the magnet and nothing so far - any other tips?

Hi John, No air hissing out and the water hasnt moved from the header tank. There is a little gunge around the outlet but I have pushed a wire cooat hanger in and it has gone all the way in suggesting that water should be able to move down the pipework

Yes there is a small tank and yes there is water in it

Thanks Andy, the pump is working, but no water seems to have entered any radiators and where would the bleed valve be for the main system. It seems to be a pretty antiquated system

I've just replaced a radiator after draining the system, I have turned the water back on and started the central heating but both the hot water is cold and the rads dont heat up - help!