Quite an interesting thread... I don't have winter tyres and am wondering where I could
store them if I did...
Problem is with tyre fitters - they don't tend to like fitting tyres if they didn't supply them, so I would need 4 more rims as well... Hmm... A different look for the winter?! I might just be convinced...
The winter tyre debate aside, the OP claimed they had 3mm of tread left... Personally I think that it quite scary! A legal minimum tread depth is just that; a legal minimum... Thats not to say your tyres are safe when they have a few tenths of a mm more tread than the legal minimum. There was a test in AutoCar (or AutoExpress or some such mag) a while back where they tested tyres with varying tread depths. The test showed dramatic increases in wet stopping distances when tyres had 4mm and even 5mm tread. The conclusion was to change your tyres when you have 4 - 5 mm tread left... And not to leave it until you hit the legal minimum.
Seeing as though the UK is so wet..........