Had my W204 C220 CDi for 10 months now and really liking it. I drive my battered Volvo to work and my mrs drives the Merc to work. Being lowish profiled rwd I don't expect it to be good in snow, and a lot of roads here in West Wales aren't gritted, so I'm seriously considering buying a set of steel wheels and winter tyres to put on from the end of this month to maybe end of february. Any reccomendations as to what size/profile I should be aiming for, I think narrower should be better grip. And, do I need to inform my insurer? Thanks in advance.