Really? Lift-the-dots? How weird - I've never, ever seen these used for carpet fixings. Treading on them would make a right mess of an ally floor pan. I don't doubt you're right, I'm just amazed as no other British car of the period used hood fasteners for carpet.
Woolies Trim - Lift the Dot
Roger
edit - I stand corrected - I've just found a site that lists them for MG. You learn something every day.