Steve Q

Think n5d is a beige leather if I'm not mistaken? 
This link has numerous Audi codes which might help: 
https://www.bezwypadkowy.net/media/kunena/attachments/63/audi-option-codes.pdf

I've been having similar issues with my older A6. I've resorted to my mechanic giving me the party number then searching that part number on eBay. This method has not let me down yet. Wider your search to international sellers too as this is what I had to do. 

This shows the difference between the two. 
Pic 1 c6 
Pic 2 c7
 
 

It can't be disabled from my knowledge as it's part of the safety system. 

S3 brakes or would TT brakes fit? 

Looks like some of the pixels have gone on your LCD screen, however I think I can identify it as a bulb out. 

I'd recommend a stainless steel straight through exhaust, induction kit and then the remap. Obviously you could look at upgraded cams, manifolds etc but is it worth it? 

Yea but you could blank it at both ends. 

Thanks for the heads up 🙂 glad you got sorted 👍

As promised, I found it under the TT section but the principle will be the same. 
 

If it's the garage you've bought it off telling you this then I'd suggest getting a second opinion from another garage. If a fault is found them the garage that sold it to you should fix the issue free of charge 

There are different types. It's the back contacts that are most important as they have to match. You could try a vin decoder as it should give you the options list on your car which might help narrow down which one. 
Alternatively there should be a part number on the cradle. If you speak to Audi parts department they should be able to advise which phone matches the cradle. 

I'd recommend a diagnostic check to see if any fault codes flag up. It could be a clock spring and it's not unheard of them failing.