There is a screw on the underside of the end of the hose opposite to the tap.(third picture in the imgur link above) If I turn that screw halfway or a whole revolution, nothing happens. If I unscrew it further, water starts to leak out from around the screw.
http://i.imgur.com/GgjqAFN.jpg
After bleeding some radiators, my Ideal Sprint combi boiler stopped working. Pilot is on but when there is demand on the system it does not fire up. From reading around I understand the problem is low pressure (should be 1-1.5, currently less than 0.5)
I'm trying to repressurise the system...