A bit more mystery info Andrew. Vehicle in at Austin's for 60k service and EML.
Nick reckons that MGR may have been about to update part numbers when they went bust. TYG000260 is probably the same bolt. However, TYG000260 is 1.25 pitch.
One wouldn't have thought that a simple bolt would cause such grief!
Kev
p.s.
Is the Febig box pic relative