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Hi - I have what I think is called a system boiler that's providing central heating and hot water to a tank in the airing cupboard. How to I repressurise this? It's a Worcester Bosch Greenstar 24i but it doesn't have the usual filling key arrangement. Under the sink near the boiler there's a...

This is a house with pre-2006 wiring. I was exploring the wiring behind a 2 way varilight dimmer switch with a view to getting rid of it and just replacing with a normal switch. As usual it's a bit of a snakes nest - diagram attached and photo. All the cables connected are Red. How do I map...