Let's keep this in some kind of perspective.
The Winter Tyres thing is a fairly recent fashion trend in most of the UK. I'd not heard about them (snow tyres for the Turini in winter apart) much until the Poles and Czechs started to ramble on and on...........
Of course, the temperature thing is important. In sunny Liverpool, however, I've been quite happily running "summer" tyres (I like Rainsports, BWTH) throughout the Winter.
Ice apart, I've never found that my bikes needed winter tyres, either (and do Winter tyres work on ice?)
My guess is that unless you live on a hill, north of Glasgow or in the East (Norfolk, Lincolnshire, etc.) you'll do quite well without.