ICING !!!
In Northern Europe this is the problem. It's all very well flying IFR in IMC but in a single you have no de-icing kit.
And I think the Cessna 310 is one of the few multi's that is cleared for moderate icing, so most are only light icing.
With icing levels on the deck or thereabouts for much of the winter, the best place for non IR heavy metal pilots is in the bar beside a log fire with a large Grouse.