Hi Guys,
I replaced the front springs with the original (blue) springs this weekend. It makes quite a difference! I took it for a little drive around the suburbs and then onto the motorway and I must say that I feel a lot safer than before. It corners predictably and smoothly.
The heavy duty springs I took out were green. They lifted the front of the vehicle by 4 - 5 cm.
I bought a kit which had red/white springs for the rear, green for the front and a complete set of rubber bushes. Will have a word with the supplier and see if he has had problems before.
Thanks for your advice Paul