I've had one big moment on wet leaves & mud on a Devon lane. No great speed, probably less than 25, but it just wouldn't slow down. The gap I got through was an inch too narrow really, which meant clipping door mirrors, but no damage. The other driver must have though that I was a loony.
Maybe I was.

DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4