Listening to a minister on the radio a couple of weeks ago, the reasoning was quite simple. Pre 1960 cars make up 0.6% of cars on our roads but are only involved in 0.03% of accidents. Make what you will of that statistic but the implication is that owners of pre 1960 cars are a lot more careful with their vehicles, and how they use them, so can be trusted to keep them roadworthy.
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