For anyone that stumbles across this thread (like I did).....

I live in Ayrshire and have just had my detachable towbar with dedicated Skoda electrics and reprogramming fitted to my 2017 VRS Estate by 'Lomond Auto Electrics'.

£540 all in.

With the reprogramming the reverse sensors don't work when trailer is connected and the additional icon comes on the dash to show that you are towing. 

I have attached some photos. It's perfect. No clunky metal work hanging down when not in use. 

I know this is old but has anyone managed to make the cut out piece into a cover for when not towing?

No not yet.  My towbar came with a cover that fits into the mechanism when not in use so never got around to it. 

Couldn’t be bothered with the effort. It doesn’t get dirty in there, there is a cap to plug the socket when not in use and you can’t see anything of the opening unless on your hands and knees. And if you do use the cut out as a cover, it’s just more faff to mess with when putting the swan neck back in.