Thanks Mike,
I took the Beat for a spin today and it's running perfectly.
If I loosen the bolt that secures the distributor and turn it by a couple of degrees I can get the code 9. Twist it back and it is gone.
Steve, You're spot on when you say how easy it is to get a code 9 without a mechanical fault. I'll flick a link to this post from my earlier "code 9" post as it's such a great resource.