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You can never make the assumption in a lighting circuit that the colours will signify the line and neutral. I can't see where the red cable with the grey sleeve is going to or coming from but the dimmer those 2 are connected to is just functioning as a connector block and could be replaced by a wago.
What you have there is a 2 way setup on the left hand side (from the front of the switch) so that either position (or click on and off) will energise one 'switch line' or another. The current is coming from a connection elsewhere possibly on a 3 plate.
Airhead
iamalex
Does this wiring look suspect? It’s a double dimmer. One dimmer controls some overhead lights. The other dimmer we have no idea what it’s meant to control as never worked. Possibly some wall lights on the kitchen wall. Kitchen wall and overheads also controlled by toggle switches on another wall. In the pic, the upside down dimmer with two live wires is non functioning.
There are two cables with L, N, E and then a third Live.
I have a new posh dimmer I can swap in with like for like wiring but would rather not destroy it if this already looks suspect. Am thinking this gets added to an electricians list later in the year whilst I tidy the wall around.