I might have a set coming my way for a classic, will the wiring already be in place to handle this or is a fair bit of wiring involved?

 

The mirror wiring on the door should be there, so thats easier. Then you'll need to run a wire from the switch to each part of the door wiring loom, you can do it under the carpet, its no so hard.
Thats assuming you are talking about wiring electric folding mirrors.

 

Certainly am, cheers for that

 

https://www.scoobynet.com/lighting-o...x-mirrors.html
https://www.scoobynet.com/projects-4...rors-help.html
couple of guides