I thought at one point to get a little 1000cc Panda 4x4 - then I saw a) how few of them there are, and b) how fooking much they cost when available!

To be honest, although getting another car is probably the better option, I'll probably get a spare set of rims and winter tyres; mainly because I bought my IS because I was sick of running around in shitters, so don't really wanna get another shitter, even if it's only for a couple months, and also because a spare set of rims with winter tyres will last for years, with the little use they'll get, whereas I'd need to buy a shitter every year, or buy one to keep and have to maintain it and tax and mot it every year, plus dealing with the SORN which I think you have to do if you intend to keep an uninsured car on non-private land...