Back in 2013/2014, When building the cars, were there any upgrades that were generally installed (as it may have been easier) that just need a some part installating to utilize or was each car built to the exact specification? Wouldn't mind Auto Lights if everything is in place and just needed a new switch! And anything else that'd just need something some doing!

VAG group as a policy only build cars to the spec ordered (only exception I know is US spec cars have the pre-wiring for their satellite radio system installed).

Though as much.

I'm positive my old Mégane had most of the wiring etc in place ready for the relevant switches and sensors to be installed, only good thing about it though!