Haraka,
IIRC, all BMW Isettas had 4-speed + Rev in a "gated" box on your right (like the old racing cars). But it might have been one of the others (like the original Italian "Isos") that had a combined m/cycle engine/positive-stop gearbox , no reverse in that (until the 2-way ignition switch - which was really a counsel of despair - came in. Bond went for that, and others).
Whichever, he didn't have to wait for his wife. His escape route was over his head - out the sunroof !
MPN11,
I think you mean that the garage was 3in
more than the XJ6 (bloated plutocrat !!). I've done the same with a length of thick plank.
Nitpickers of the world, unite !.... Danny.