As a side note, I encountered the following;

On friday morning in Germany I had a quick look at Andy Moores car, and noticed that he had a different setting for static caster on each side of the front end. On one side he had the thick washer at the back and the thin one at the front of the caster block. However, it was the opposite on the other side. I asked him why, and he told me to measure the static castor at the kingpin, which I did, and it turned out to be the same on both sides. I checked mine, and had 1 degree on one side and over 5 degrees on the other!

The problem is caused by the upper wishbone turnbuckes - they are difficult to screw in perfectly straight, and this results in the top pivot ball moving forwards or backwards altering the static castor!

Instead of running different shims either side, I tweaked mine with a pair of beefy pliers, and it made the car miles more consistent, and got rid of the tweak I thought it had that I spent most of the day looking for!