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How do you increase the pressure on a scottish gas 532i?

Since I bled the radiators the pressure on my boiler has dropped to just above 0 and the system is not heating the house. I have tried to use the filling key but it seems stuck - how hard can you turn it and which direction?
pumpkin, January 2010
the first page of this manual tells you....

http://www.worcester-bosch.co.uk/cache/file/4/installation-and-servicing-instructions-for-greenstar-cdi--part-2-of-2.pdf

Ian, January 2010