Many thanks Gareth for that very useful info. Thankfully my wheels are just 18s so the springs must be the issue. I did find an S line in my gym car park and the owner kindly took me for a spin and a lot better ride than mine
I have recently purchased a diesel TT Roadster that I love except that previous owner fitted springs that are about 30 mm lower than standard resulting in a harsh ride. Any experience appreciated on getting softer springs please