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It's the Highclere Castle episode from Friday/Sunday. Around 10mins in they field a question about a drive. Haven't worked out how to post links from the new Sounds app.
Their suggestion is basically what you've said. Sort of a farm track style. Iirc the suggestion of ferns is because they'll tolerate being covered.
Sensibly one of them points out to leave enough room around the parking bit to get out and around the car to the boot etc.
Thought I'd share these suggestions from GQT for ground cover alternatives (also because I'd like a reminder).
Semi related drive way suggestion of ferns like (and these may be incorrect): Athyrium polypodium, polystichum.
From looking into Corsican mint I'm wondering if it could be used as a living roof.
Out of curiosity has anyone built a living roof? The area I'd be looking at is, I think, reinforced concrete with some sort of tarmac-like roof felt... it could just be very old torch-on roof felt hence why I don't quite recognise it.