Apologies for not posting sooner, things have been busy with outside work and I haven't had much time in the garage.
I dry assembled the exhaust to see how it fits and also to mark where the central mounting bobbin requires to be drilled to the gearbox mount. I pushed all the components together and it seems to fit! I marked the bobbin and drilled the mount in situ. I may have to rotate the cats slightly to make a bit more clearance from the chassis. I will do this just before applying sealer and the stainless clamps. I also need to drill the rear rubber mount to fix to the chassis.