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Thanks for all your advice much appreciated!

... but if the mains water to the boiler had been isolated surely there wouldn't be any water to draw to fill the system? We tried a combination of the valves but pressure didn't increase. The scary thing is the overflow still drips when all 3 black valves are closed?!

That valve is closed. As I thought that when that and the one next to it on the right were open, the CH system would top up via the filling loop? Or am I getting confused?

unfortunately don't have a picture, as away from the house at the minute, but the pdf installation manual can be downloaded here...

ok thanks, i've only really developed my knowledge of boilers over the past week! From what I could see there doesn't appear to be a black in-line isolating tap for the mains inlet, does this look different on the Britony 80? Is it something you twist or need a screwdriver for?

Do you mean the DHW flow valve needs turning off?

Thanks for your fast reply. I'm assuming the "cold mains" is different to the "cold water inlet" (i.e. which links the filling loop to CH return)? If so where is the cold mains isolator likely be located and is this easily turned off? At the minute the CH flow, water inlet and CH return...

Hello, I feel like I've searched everywhere but couldn't find a similar problem to this! We've just bought a house, and although the electric and gas aren't yet connected, whenever we turn the water supply on at the mains, the boiler overflow starts to drip/mini stream outside the house. The...