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I've just moved into a new house (new for me, quite old actually) and am trying to understand the current electrical wiring. As part of this I opened up one of the existing light switches to take a look. It's a two gang switch, with the left switch being a 2-way and the right switch being a single/local switch. There are two white sheaths of wires, both with red, black, and green/yellow. These are wired up as I would expect and I understand what each of them is. But there is also a separate grey wire which is not connected to anything. Any ideas for what this is or how I can safely find out? I'm wondering if it's a neutral, but am not aware of that having been a convention in the UK?