If your car had an EGR fitted at the factory, then as of a date (March?) this year it will fail the MOT without it.
This will of course depend on whether the tester knows it should have one or not. On Discoverys one or two of the letters in the VIN tells them if it left the factory with a cat and EGR or not.
I expect it's the same for all LR products.
If the engine cover is fitted then the tester won't be able to see it. If the cat has been removed it'll be obvious.