Our old Spitfire sheared a UJ and the suspension collapsed on the way back from Santa Pod once. What a sh*t suspension design.
Certainly couldn't repair that by the side of the road.
Oh yes you can, OK it took three hours, but she made it.
I keep a spare UJ in the boot.
I had to replace the dougnut on my MK2 Vitesse rear axle on a camp site in Newquay when I was a lad, even when my dad bought the tools down for me, it was a rotten job - in the rain of course!