BMW 5 Series E60 - snow socks - tmjs

Hi,

has anyone used "snow socks" for winter driving in the UK? If so, how did you get on with them?

I'm thinking of getting some to keep in the boot as a "get me home" measure in the case of unexpected snow / ice.

For a RWD car do I need 2 pairs, or just 1 pair for the rear wheels? Any recommendations on brands, or are they all pretty much the same?