Just in case my Glanza fails Mot on emissions will need this setup, to put through mot ...
Again.
You shouldn't need to mate, depending on your MOT tester/test station.
My car went through fine on emissions as it was tested as an import on basic idle test etc.. Not like the comprehensive UK cat test we have. Do a little research on local test centres to you and shouldn't have the need for a cat.
Hope that helps.