Firstly, thank you to everyone who is taking the time to answer my increasingly complicated query!!!
I have just posted a third photo - it's not great but it's the furthest I can pull the switch out of the wall to get the photo. It shows where things are going in but i cannot get a shot of any markings. There is an earthing lug there as well.
Also, for the record, this switch which is the two gang, two way. The other switch at the other end of my lounge is a straightforward on/off switch. It is actually a three-way switch as it also controls another light. My point being that it is not a dimmer.
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