You can set yourself up for - compared to your exiting setup - a lot less, it will save your alloys and as they are a lot thinner give you more grip. East Yorks does get a fair bit of bad weather so its probably down to your own opinion if you feel they are warranted in this country
What you have at the moment is great anyway its just adding to it. I was considering some steel winter wheels with associated tyres, I was then going to paint them bright green or orange just for kicks :)