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Yes, I've closed the link. I don't know if there's a drain off point and I don't want to start unscrewing things without knowing what the are. Does anybody know this system's fittings? I can't help thinking that, if there's a simple way to increase the pressure, there should be a simple way...

After bleeding all of the radiators in the house, I discovered that the pressure had gone very low on the boiler (Worcester 30si). I knew how to increase the pressure, having found some advice on this site a few months ago. I opened the tap with the plastic key underneath the boiler and turned...