snip
I'll
bear in mind the heated air suggestion at the inlet manifold also. The
half gallon of petrol in the tank I'll resist.-

IIRC, after the winter of 1981/2 -when I also encountered scores of
stranded diesel lorries and vans, with widespread minima of -20C and
below, the legislation was amended to include a winter fuel additive
in diesel to prevent "waxing" at v low ambient temps. Whether the
milder winters of late have caused a relaxation of this requirement, I
don't know. I only saw it happen in that particular cold spell and we
did have others in the 70s and 80s which gave temps of -10C and lower,
which suggests - parts of Scotland excepted - we're nowhere near the
temps required to cause the problem ...... yet.

- Tom.