Extract from "Lincoln at War" by Brian Goulding and Mike Garbutt.
"One of 97's Lincolns, SX939, was nearly lost on the night of 29 November 1951 when, on a night bombing exercise over the ranges, it got into a spin in thick cloud over Mablethorpe, falling from 9000 to 5000 ft, then spinning in the oppositedirection until being pulled out at less than 2,000 ft. The fuselage was so badly twisted it was declared a write-off, and in December was transferred to No 2 School of Radio at Yatesbury"
While this is not the Lincoln mentioned in the original post, it seems that inadvertent spins can occur in this type. Nice bit of night limited panel spin recovery all the same, because for sure the artificial horizon would have toppled.