Thanks dude. I think the Cat is located straight after manifold. Here is full standard system.

http://www.cats-direct-shop.co.uk/ex....php?ID=361760

Dont really know why the garage wouldnt just put a cat on? He said something about 3 bolt or 4 bolt flange? If that makes sense?

May have to take up to ashford back to Longlife for them to make a section for CAT to fit onto? Really have no idea apart from this!