UK Car Repair: Location of Inertia Switch, inertia switch, jaguar xjs

Question
I recently bought a 93 Jaguar XJS.  I cannot find the inertia switch, where is it located?  I have searched the passenger side, driver's side and the boot.

Answer
My mates mum has one, I'll check the manual when I get time - As far as I know it's a fuel cut off switch, I think it's a plunger - possibly in the boot, could be behind a circular cutout in the passengers footwell that prizes out with a screwdriver then the plunger/reset button is behind there, otherwise it's a normal inertia switch located in one of the fuseboxes, look for an empty slot, the inertia fuse itself could have gotten lost behind the dashboard, in some nook.