Hmm... now how do you get in... roof...?
... like an Isetta (remember those?).
Given that the other three were Brit-produced and therefore, inevitably, failure-prone, the Isetta must then have been the only car driving on British roads, interesting.
... and therefore, inevitably, failure-prone, ...
My buddy in Devon still has a green Herald running that his dad bough his mum from new and there are almost certainly more Morris 1000's running than any equivalent BMW from the period... no denying they've had a better run since then...