I'm with the Doc on this one.
The loss that you will realise when selling the Golf will more than pay for a prefectly serviceable used 4x4. You will probably only need it for a few weeks of snow each year, so the rest of the year won't have to put up with its higher running costs and normal road compromises. Obviously you will need to tax it, but you can insure them through a specialist insurer on a limited mileage, agreed value policy. The type of policy that people use that go green laning. I know a few people that pay well less than £200 a year for theirs.
Seriously, do the sums, it adds up.