Sorry this happened to you.
I love your country and the people there are polite and the strawberries are amazing there - Beekers Berries - never experienced anything like it
I will be getting something like this done soon when I get my new front tyres fitted - just had new backs. I am going to Northway tyres in Colindale, London. They used a torque wrench to tighten my wheel nuts which I liked. Also, for allignment, they use something called a biometric eye. They say it...
I am no expert, but I am sure the remote blue wire coming out from your stereo goes into the remote connection on an amp. So, unless you are running amps, you do not need to connect this to anything. Wait for others to chime in as I could be wrong. I always wire up my own system and it seems to work...