Brief update... spent some time detailing the car, got front bumper painted, added a RenaultSport splitter.
Took the engine out a couple of weekends ago, sorted heatshield whilst I was there. Replaced starter motor heatshield with a bolted one to avoid the issues I suffered at the Nurburging (shorting and killing fuse, due to hitting too many kerbs at Spa).
I also fitted a gearbox I refurbished over the previous months - TL031, new syncros, bearings and finally - a diff from Val Racing (Torsen with preload).
Replaced all the engine mounts at the same time.
So happy with the car now - will upload photos/write some more if people are interested. Diff is for sure one of the best upgrades that can be done to a 197.