happy new years by the way.
have them on both axles, only thing that keeps you on the road.
Check with insurance about winter tyres - our insurance is actually lower because we use them in winter. Winter tyres are of a different compound that stays soft in the cold weather, normal tyres harden up and therefore give less grip, also the tread is much more aggressively cut to grip in snow and they also perform much better in wet conditions.
I reckon we got 15k miles from last set - would have only changed fronts but because I couldn't get same tyre I changed the lot - I can't have 2 different tyres on the van, it does my head in.
Got the big van tyres changed start of November, was able to get fronts for it at £130 each, rears were ok.