VW T5.1 Transporter Pin 10 issue / VCDS coding

Hi,

I have recently bought a 2nd hand 2013 VW T5.1 Transporter fitted with a Westfalia detachable towbar and dedicated electrics - however there is no power to PIN 10 to provide fridge and battery charging in my caravan whilst being towed.

I have an additional wiring harness given to me by the previous owner which is an additional wiring harness to provide PIN 10 and the corresponding earth with power (not the Earth obviously). My question is how easy is it to find an ignition controlled feed which is required to fire the relay in the kit?

I also then believe it needs to be coded so that the reversing sensors do not work when the caravan is attached and the ABS/ESP is changed etc if anyone has a VCDS in the Cheshire/Staffordshire area who can help me out with this?

Thanks in advance

Andy