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Got it chaps... if I turn it towards me it reduces the pressure, so snapping it back in the opposite direction should seal it. Trying it now. Will let you know.

Thank you both - very helpful. Do I just twist the plastic red end to try and get it to seal? It feels a bit wobbly, not sure if I'm twisting it correctly.

First off... I know NOTHING about CH systems, I'd just like to be pointed in the right direction of a problem so that when I do call in an engineer I don't get the "Oooh that's a new boiler you'll be needing mate". I opened the valve (at the back) as the pressure had dropped a little. Went...