Okay the pressure gauge was on zero so I've re- pressured it but it's gone to 2!
I cannot bleed the radiator as I don't have any tools
I haven't turned the power back on yet but will it be okay at two?
It's not in the red area
Ok
Well I did not need a key I used a knife - instead of a flat screw driver
I've removed a good two bowl fills of water from one radiator and it seems to have worked it was going down but then it's gone back up
How can this be as the power is off?
Should I try another radiator
Water pressure is not dependent on the power, it is pressurised from mains pressure. Keep removing water until you reach 1 bar . do not be alarmed when you switch your heating on for the pressure to rise slightly. If you keep draining with no effwect make sure you have turned the feed water off firmly.
I realise now that my experience is not of this type of system. Mine is automatically filled from a tank in the loft, so bleeding would have no effect on pressure.
Don't worry as the water heats up the pressure will go up. the noises are almost definately because of the amount of draining you have done and will settle down. Check it again after running for a few hours and if all ok you have fixed it . Congratulations you have saved a big call-out fee.