Excellent day at JDM Coombe after finding the root cause of all of my snap oversteer issues!
After pulling the suspension about, I noticed that the OS rear wheel was sticking out at an angle by around 4"
God knows how I have even been able to drive the thing as the toe rod was moving too and fro, which explained my issues .
There are tags that stick out on the subframe to keep the adjustable camber/ caster/ toe plates in check, turns out that when I had a Civic hit me in the side at Silverstone he must have hit the wheel as the tags were knocked flat allowing the wheel to literally waggle around, no wonder I couldn't control the thing at times!
Change of pads to Hawk HT10 plus a new Extreme Brake fluid, as supplied to F2 cars and Historic F1 cars, plus the new Kazz diff, plus TDI introducing a little more camber and toe in at the rear has really sorted the back end and the car out and it is soooooo much more stable.
Brakes now have super progressive brake feel and stop the best the car has ever stopped
Only down side to the day was that the back wing literally collapsed after going faster that the car has ever gone before during the second session where I started "trying" on a clear track!
Talking to Carl Hayward after he believes that by using 8800 going into quarry, this probably means 150MPH so no wonder the wing collapsed.
Now I have a controllable car, I am really looking forward to Rockingham in a few weeks time