Found a plug on the passenger side (UK CAR)

[Davegoorn]

Hi All

while searching for a fuse i popped off the plastic trim on the passenger side (same trim that covers the fuse box on Drivers side) and came across a plug which is unplugged i have attached a pic of it anyone got any ideas what it is and what it does?

[Davegoorn]

Doesn’t look like the pic attached so I’ll try again