I've just got this wall cross section from the architect and he's asked me for comment, so I thought I share it with you to see what you thought of his proposal?

you could add thicker eps and render onto it with no battens. need vb internally with t/f

need to run a land drain round outside, I am not a great believer in tanking, but if you must, keep it dry, make sure basement is nicely warm and well ventilated

Not sure how your radon barrier works, radon gan go through concrete, rock and polyethene,