The Cooper S in the photo above has original unrusted Hydrolastic suspension, we fitted gate vales to the pipes which stops it pitching front to back as much.
You are right Tony they did spend a lot of time and money, and as such the basic geometry really does take some improving on. The only ' modern' car which I can say was really up there with the Mini was a Mitsubishi Cordia, a 1.6 suck through turbo with about 140HP in a 2 door coupe, 205 1.9 comes 3rd for me.
Anyhow the hydro tweek won't apply to yours, for a decent road use;
Standard rubber donuts, with hilo's which means you can set the ride height a bit lower.
Adjustable dampers or simply uprated.
If you don't go too low and have the dampers set too hard potholes are better as are 10" wheels.
If you want you can go to town with adjustable bottom arms and tie rods at the front, so you can set camber and caster....
and adjustable rear toe and camber brackets.
The whole issue front and back then has to be correctly aligned, caster, camber, front tracking, rear toe and camber
You will then have the optimum setup....
The red S has all that and with 110bhp and 165 yoko tyres is like a rocket on rails, serious fun.
If you want a special for potholes you have a choice from our workshop....a New Holland 7840, a 30 series John Deere or an EVO rally car...I know which I prefer... LOL