Reviving this thread.
Centre Gravity worked their magic yesterday and the car is so much better. It feels a lot like the one I drove all those years ago. Its a lot stiffer, the car isn't skittish or light at the front any more, yet almost all the changes were done with the back wheels. It is now set up for the road rather than track, but it feels so much better on the motorway, a and b roads. Money well spent, but I wish I had heard of them years ago.
After all of this the car goes on Saturday as I have sold it. I am happy the new owner will benefit, even though I won't.
Conclusion is that a few small changes can add up to a massive change, but you need to visit the specialists.
Specs attached. It won't suit everyone as we are all individual and want different things and each car is different.