"would be shared with researchers or policymakers has put the wind up campaigners."
Rightly so.
An NHS data fetishist is just like every other one of them
Someone with a grossly disproportionate interest in your (and everyone elses) business.
It's not a policy option. It's a personality disorder.
proper data interoperability is a good idea, but once the mechanism is in place what it's used for a policy decision, and let's face it the UK government track record is that they don't give a s**t about the people whose data it is. They get lost in all sorts of abstractions which (you will be told) are for "The greater good."
Whose "greater good" ?