A6 Allroad 2014 key programming

[kingb]

So I am a bit of a muppet and I lost one of the keys to my car! Its keyless so just need the key in my pocket to start it.

Im left with just my spare which means i am in trouble if i lose another. I can see on ebay plenty of replacements for about 20 quid but does anyone know how to reprogram - I can find plenty of videos for older keys where you have to use the ignition but nothing for the clever wireless version!!

Can anyone help before I have to take the car to Audi and pay through the nose!!

Thanks

Matt