George---Try backing out the other Wedgelok bolts to see if they are in
danger of also becoming loose. (These are not usually something to
expect to loosen.) Take it from there.
I enjoyed your English humor here, but it's people in a hurry that will
sometimes leave out some of the bolts that secure the bell housing to
the engine backplate. I can't imagine these "unscrewing" either,
especially when the Nyloc nuts are used.
It's a good idea to use the two dowel pins here, to insure alignment
between these two units. See the Buckeye website (under "Reliable
Clutch") for the location of these dowels, should they now be hidden
with paint, dirt, etc.