Hi Andy,
Because you are there perhaps this information will help you.
It is about the alignment.
I have written this article to help the Dutch Cobra world.
You can find there a Alignment tool drawing that you can print and use to have a basic setup of the CASTER.
http://www.donostia.demon.nl/index_files/alignment.htm
Jaguar has two types of Caster shims; the thickness is what it changes.
One shim (old One) is 1.64 mm and the new ones are 1 mm thick so be careful when people say 4 shims because there would be a lot of difference when you use one or the other.
My advice is to have 4.5 of caster; your steering wheel will come back easily and the Camber compensation would be OK.
Almost the same article at the Dutch Cobra Forum can be seen here.
There you can see all the angles that DAX have use (advice) through the years.
Our DAX Benelux Importer has work with us to setup this information.
http://www.cobra-forum.nl/topic.asp?TOPIC_ID=44
Best regards,
Cobra289