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Thanks for replying Mottie. My plumber eventually got back to me and called over. Had it sorted in 3 minutes. The pressure gauge in the first picture from my hot-press was the offending party. He tightened a bolt on that to increase the flow and the pressure was back.

I tried to bleed a radiator but only water came out. Now my boiler (Viessmann Vitodens 100) has an error message which means it needs to be re-pressurized. Problem is I cannot find the filling loop. I think I found something that might be it in the hot water cylinder press but I cannot figure...