My 55plate S/C has a detachable tow bar in the boot I know that much! What about electrics? Are there any under the car ready to accept a plug? Or do I need to have a them fitted to tow a trailer with a tailboard? If so what sort of costs involved having this installed??

I’m in the office and the car is at home so I’m not able to check until tonight. I'm sure somebody will know the answer to this?  Cheers Laurence.

In the rear bumper there is a removable section that hides the recovery eye and the towing electrics (if they have been installed) if you take it off. In this pic it is the section above the red blanking piece for the tow hook

Click image to enlarge

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then pay one of those mobile towbar fitters to wire it in  RRS gone
Audi SQ5...Gone Audi Q7 S-Line 240 3.0TDI Gone
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You don't say if you've removed the panel that's above the towbar fitting - if not there are two large slotted plastic clips which rotate thro. 90degrees and the panel will drop down. your trailer electrics connectors will be visible.

It would be unusual for a tow bar to be fitted without the electrics whicg come as a kit that plug into sockets behind the n/s rear wheel near the rear light; you'll need an earth connection.