I ordered my wheels and tyres ready-fitted from mytyres back in October. The order confirmation says the wheels are:
(LK 5 x 112.00 x 57.00)
And the tyres are:
Michelin Primacy Alpin PA3 205/55 R16 91H
My stock alloys were 17" and I went for slightly narrower tyres: 205/55 R16 instead of 225/45 R17. This because I read that narrower tyres are slightly better for grip in snow, and I don't do much/any 'spirited' driving in winter anyway.
I was told it's fine to use the standard bolts, which I used without any problems (so far!).
I can't recommend winter tyres strongly enough. Can't believe nobody told me about them before I read of them on this forum - they make a huge difference in this very cold weather even on dry or wet roads - not just ice and snow. I say go for it; you won't regret your purchase!
The Vredestein winter models seem to get very good
reviews on here, and all the online
reviews seem to say that the Dunlop Wintersport 3Ds are also great. I chose the Michelin Primacy Alpin PA3s because of the low rolling resistance and good noise/comfort, combined with competent grip in bad conditions.
Studded tyres are not legal in the UK, I've read. There are specialist Studless Ice/Snow category tyres, which are much better on sheer ice etc then 'Performance Winter' tyres, but they're crap for the usual winter weather we see: rain or dry with low but not freezing temps. The mainstream winter tyres are good in cold weather generally even though they're not as good on ice as the above hardcore Studded or Studless Ice/Snow type of tyres favoured in e.g. Nordic countries.
Hope that helps!