Great news Christian, you won't regret a minute of your ownership, I find it even more special than a standard +4 whenever I take it out, mainly I suspect because of its' dual character.
If ever you find yourself in the West Country and want to meet up for a chat, do pm me, I live just south of Taunton.
Thierry, thanks for posting the link to the Cosworth Guide, on a brief skim read, it looks very useful and I have printed it for reference.
Paul.