Yes, it sounds like crank sensor, but you were unlucky that it died so terminally first time. I have had them fail on 2.5s, then after quarter of an hour I could drive the car 20 miles home. On my wife's 3.2, it died, after 10 minutes it restarted and she got it 10 miles home; I drove it 20 miles, declared it fine, drove it 1 miles to MOT the follawing day, and it died completely on the way and never ran again.
I suppose I should carry spares, but they are tricky to change at the roadside so Igo on hoping it will get me home next time. Also my fleet is 2 2.2s, 2 2.5,s a 2.6 and a 3.2. I have spares for the 2.5s. They are sods to change on the 2.2s, and my wife and daughter drive the 2.6 and the 3.2, and I doubt they could change a wheel, so I should hve to drive to them and fit a new sensor myself. I must check if I even have spare sensors; I recall Terbert got a sensor for the 2.6/3.2 for £10; money well spent.