Your post has left me feeling quite pumped up.
I too had a puncture on the M3, at 80mph in the fast lane the warning popped up, and I watched with mild astonishment as the display showed pressure dropping from 36psi to - Nothing in the space of 20 seconds.
I eased it over to the nearside lane, and at 50 (later 60) mph I cruised 20 miles home. Next morning I drove to a tyre place where they fitted a new one.
Runflats seemed to work ok for me.
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