Re: Same old arrogance
"People share a lot more data with Nectar cards and loyalty cards. They know where you've been, what date and what you've bought"
People are not opted in to loyalty cards by default, unlike the original Care.data plans. More importantly they're unlikely to suffer high insurance premiums (or refusal), or have their employment prospects affected by distribution of anonymised shopping basket data - plenty of people in a given postcode will buy bacon, butter and bread; very few will be Female, 50-59 and have breast cancer, high blood pressure and epilepsy.
It might have escaped your attention that not everyone signs up to every data harvesting scam offered, or is your view merely skewed by vested interest?