Sorry guys, I don't know how it happened but I've posted this thread in the wrong forum.
We have a 244GL, not a 440Gl.
Bit of a difference, eh?
But I guess the answers (minus stuff about ABS) remain the same: it probably was a stalled engine.
I find it a bit frightening the thought of a dead engine knocking out your brakes and steering. I'll take the advice and try it out in a safe place.
I've told the wife to drive carefully and don't forget the grab the handbrake if it happens again. But I feel pretty sure it won't. She had just started up and it is not at all unknown for it to cut out right then if you don't let it clear its throat a bit.
She must have been on a downgrade, I guess and it was night-time and she'd have been exhausted by working all night and distracted by the friend she gives a lift to every night.... so she forgot the handbrake.
But what happens if you're at speed? The motor can cut out at speed? And then you'll lose brakes and steering? Frightening. I'll check it out.
Perhaps the moderator can move this thread to the 200 series forum. My apologies.