switching

Hello Everyone, I hope someone out there can help please. Basically I have two way switching for my top landing light which can be controlled from the switch downstairs, and can be controlled from upstairs. The switch has become ancient and I have managed to change all my switches upstairs and...

We've got a standard water tank with a bottom element fed from the economy7 wiring, and a top, "boost " element wired to the standard wiring. Unfortunately it's quite a small tank and if someone has a bath in the morning there is no hot water left, and the boost only heats the top of the tank...