We have F1s on all our cars, as they have always impressed me in all conditions except snow and ice. Since we rarely see any snow or ice that isn't much of a problem. But as you say they are very, very poor on snow.

I haven't tried the Bridgestones, but in every detailed tire review the F1s have always come in just behind the Bridgestones in the dry and been significantly better than them in the wet. I will happily trade a little dry performance for much better wet performance...

I had Kumhos on the Scooby when I bought it, I thought they were horrible. Maybe they weren't the same Kumhos as he is using though (as I know some Ultima owners who use Kuhmos that are effectively race slicks for the road).

Do you not invest in winter tyres ? I would have thought it was worthwhile living in Scotland ?