I've had a quick skim of the key parts of the judgment (https://supremecourt.uk/uploads/uksc_2024_0157_0158_0159_judgment_2bb00f4f49.pdf). Paras 267-290 are interesting, and are the basis for the rejections of the majority of claims.
In short, the SC held that it was true that the consumer placed some trust in the dealer, but no more than in a shop assistant or waiter. Those are also people who are selling as part of their service, and most people would agree that in usual circumstances, a shopkeeper would not have a duty to get the best deal for the customer. A customer is entitled to shop around, as is someone taking a car on finance. That seems like a pretty reasonable analogy to me.
There's a difference, financial products can be confusing for some. Going for dinner or getting food products from a shop is not the same as taking out financial products that will keep you locked for years and can cause you serious future problems.
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