Electrical loop removal - help! Electrical Advice

Electrical loop removal - help! Discussion ThreadElectrical loop removal - help! Electrical Advice

I moved into a house that had a double gang switch downstairs that controlled a downstairs and upstairs hallway lights. You could turn the upstairs one on from downstairs and off upstairs etc. The downstairs hallway light was just controlled by the downstairs switch. I want to disconnect any loop and just have upstairs controlling upstairs and downstairs controlling downstairs, both with a single gang switch.

In the downstairs socket there is a red and black (presumably for downstairs) and also a red, blue and yellow in a sheath (presumably for upstairs).

In the upstairs socket there is two red, a black, a blue and a yellow wire.

Both have earth wires but not counting those.

I can only get the downstairs light to work. The upstairs hallway in any combination, I can’t get it to work. Can anyone kindly offer me any advice whatsoever? I will be eternally grateful as I am losing the will.

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