As Vulcan threads seem to be de rigeur on Pprune at the moment I thought I'd take this opportunity to draw on the memory of Ppruners to give me an explanation as to what happened here:
I was happily shooting some piccies on the approach at Coningsby, when
XL445 came in to land sans the top of the fin! 50 Sqn were bolt-holing at the time, if this helps in stimulation of the grey cells.
Never did find out what happened at the time: but then, there was no Pprune!