In reply to barry donovan:
> The chains thing. They are the only way if the weather is unpredictable and you don't want to drive around Watford with clunky winter tyres on looking like a lost polar explorer.
I suspect you have little or no idea what a winter tyre looks like. They do
not look like the knobbly all terrain tyres that some 4x4 owners like to run. A lot of the time you'd be hard pressed to tell a winter from a summer tyre without looking for the three peaks + snowflake symbol, unless you spotted the sipes in the tread.
Chains are best kept as an emergency reserve, eg to get you out of a car park that's snowed up heavily while you've been on the hill. The vast majority of the time a winter tyre is all you need.
And winter tyres aren't just for snow and ice: they're more effective than summer tyres below 7°C (like it is here on the outskirts of Edinburgh right now, in fact) and when the road surface is covered in water. The difference in grip on a wet winter road between a winter and summer tyre is remarkable.
I actually ran my winter tyres all through last summer. No they didn't fall apart or head for the nearest ditch as soon as the temperature went over 7°, that's a myth. I was actually trying to wear them out a bit so I could get a new set for this winter, since they're close to needing to be replaced due to age anyway (though having been stored indoors in the dark half the year before that, they're not suffering any weather or UV degradation). Damn things seem to be wearing better than the summer tyres, though!