So, after driving back to France and getting acquainted with the SC here are some views, opinions, things to fix and general questions.
Firstly I'm still working on the brake judder//pulsating problem I first encountered. After removing the 20mm wheel spacers and getting the wheels balanced and brakes inspected, the problem is better but not fixed as it still vibrates at lower speeds and not at all speeds.
I have bought new discs, pads, ABS sensors and wheel bearings for each corner and am having them fit next week, not a small job and something I am unable to do myself so have entrusted my local mechanic to tackle (anybody know the torque spec, for the hub nut, 199NM I've heard).
After a good clean and removing the boot trim I found water in the left and right lower areas near the rear wheel arches, given that the car had been stood under trees for the Winter and had been pressure washed to within an inch of it's life before the sale I'm of the opinion that it's not a leak per se. I have cleaned and treated the seals with Shin-Etsu, and completely dried the area and everything looks good so far.
Other observations – after a quick burst on the non UK motorway at approx. 100 mph, I felt the back end was not very well planted when negotiating a sweeping curve, you know the scene, you're giving it some legs on a good piece of motorway that has a long radius curve and the back end starts to feel loose, not dangerous but also not confident. The car has as new tyres and recent new rear shocks so was wondering if this is it's normal comfy GT suspension setup.
On a positive note I really enjoy driving the SC, it's comfy, quiet and has a nice turn of speed especially in 3rd and 4th, looking forward to cruising with the top down in Summer.
All advice/opinions welcome as it's a keeper and just trying to make it as good as it can be without breaking the bank.