Hi Chris. Others will be able to tell you more about the manual box - I have an auto.

Firstly the flickering dash lights both oil and battery are normal, TADS - 'they all do that sir'

Throttle - run some oil down the cable. New ones turn up now and then on eBay, consensus is they wear possibly due to heat in the engine bay.

Chrome surround standard 75 item and an easy fix

Lastly the door mirrors sounds like a broken cable probably best to start at the link from the door to the pillar, might just be a loose connector into the back of the door switch as it affects both mirrors