In reply to sutty: Sutty and other winter tyre users know of that which they speak....well...quite a few people have voiced fairly strong opinions on this thread, but some appear not to have read the background research which has been cited, which shows (conclusively...and it's research from a variety of countries) that winter tyres make sense even in non-snowy, but cold conditions. Take the following test before launching forth with more statements:
1 driven in the Alps on winter tyres for 20 years? If yes, score 1. If no, score 0.
2 fitted winter tyres & selected manufacterer-approved steel rims? If yes, score 1. If no, score 0.
3 carefully read the background research on stopping distances? If yes, score 1. If no, score 0.
4 not scored anything yet but I will sound off about winter tyres? if yes, minus 3, if no, score 0.
5 used them for rallying? if yes, bonus of plus 10.
6 are you a minister who confuses studded and winter tyres? take 10 off.
Scored between minus 3 and zero? go and read the research. But keep your opinions to yourself since you might be advising someone to do something not only dangerous to themselves but also to other road users.
Scored plus 3...you are likely to be sensible and safe
Scored over 10...your name is Sutty