I think all drivers in the motor corps had some mechanical training. Princess Elisabeth drove an ambulance during the blitz on London for at least part of her service.
She, and others in the entire royal family refused the government's urging to evacuate to the one of the colonies for "the duration" which says something.
My Aunt June (a nurse) met the (then) Princess Elizabeth who was delivering a dead body which was very badly damaged when bombs hit a residential district of London (I can no longer remember which district).
I *DO* remember Aunty June saying that it was Elizabeth that cleaned up the blood and feces in the back.
Combined with the info from the above pictures, I'm sad she has died.
The current royals are a far cry... Meghan Markle being the low point IMNSHO. Thanks, California!