Could a member with Lexia help - I'm in Hertfordshire

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I haven't plucked up the courage as yet to install the towbar hardware under my car, but have the official citroen plug n play cabling already. As I understand it there is a setting on my car for towbar/trailer hitch that needs to be switched to 'on' is that right?

I'm in the hertfordshire part of the world, is there anyone with this software who can switch it on? Happy to drive out to you. I have beer tokens