And a source for fully leaded 100 octane petrol.
Don’t let the actual data get in the way of your opinion then John 
Braking distances alone when temps drop to 7c or below. Then we have the self clearing tread patterns of M&S verses the summer tires. Currently in 4 season tyres which were no match for my real winter ones but are a compromise.
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I have no idea what it takes, my father hasn’t driven it for about 20 years, and even then it was a brief outing for the wedding of some pal’s daughter.
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Drove a rolls a few times, most intimidating aspect was sticking that bonet out of a side turning to check the road before pulling out.
Certainly winter tyres were useful in County Durham for 4 months of the year.
Though of less help when the road was blocked by someone who didn’t know how to drive in snow and had summer tyres!
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It was a no brainer for me when working and using my van. No letting down of a customer due to a little snow. That meant earning a days money where it would have been lost, paid for the tyres.
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That’s why the French used to give way to the right. 
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I run All Terrain (General grabber AT3s) on my Range rover. Absolutely essential when we lived in the Creuse, not so much in Normandy but access to our house can be via a muddy track across a couple of fields which can be necessary when the farmers are harvesting maize.
Caution Extreme thread drift.
I think it’s ok by now to drift about. The OP has had his answer.
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Back on topic: if the vehicle is over 30 years is the process of compliance needed or, if so, is it less onerous?
Used to? Has that silly law been repealed?
Agreed. But aren’t we waiting for his answer so we can tell him what to do?
That can happen with them wrong tyres
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Thy doing that either a boat on a trailer behind you. My example was a first hand experience of a situation where four wheel drive can make a big difference. I should have emphasised the slipway bit. Pulling a boat up a slippery slipway with the front wheels of a car would make a great cartoon with the whole lot sliding slowly back into the water. A four wheel drive system removes that scenario.
Not necessarily. That’s an odd statement from a scientist.
Not a car but…
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I assume that was a typo for ‘try’ so yes, have done that many times when I was almost full time transporting dogs around Europe, with my little Teardrop trailer, but it had to be done with more speed to get the trailer wheels over the hump. 
Oh, and before someone says ‘that is only a little trailer’, any professional with tell you that the longer the trailer the easier it is because it ‘goes off’ much less quickly. 
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I know a handful of ex lorry drivers and they all drive 4X4s. I always presumed that it was because they preferred a high up driving position.
It is nicer higher up but I never found the result strong enough to take the plunge.