In reply to ballsac:
Another vehicle means another lot of road tax & insurance (and servicing and air freshener and furry dice)...but the relatively standard tyres on a land rover/izuzu/landcruiser 4wd thing might just work in *most* conditions? Until it's really bad (but will you really want to be out in it anyway?). If you can keep it (securely) off-road (SORN) you'd get away with 6 months insurance.
Winter tyres for you normal car means that you , ahem, have an extra set of tyres and potential to drive in quite a bit of bad weather and able to cope if the weather comes in unexpectedly. Unless you use the 4wd november - march, with consequent fuel consumption.
If i had the cash & didn't mind spending it, assuming weather could get horrible & I knew how to drive it it [which i'm not sure about , TBH
] second vehicle.
Winter tyres: cheaper, quite easy to fit, easier to store