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iamalex
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.