Earlier quoted context omitted.
NHS number, date of birth, postcode, ethnicity and gender. Is about as anonymous as wearing a different hat.
NHS number is clearly ridiculous. But, I can see why all the other data are statistically relevant in analysis. Postcode, so you can track viral outbreak etc with a fair degree of locational accuracy. Date of birth, so you could analyse if people born in certain seasons had higher incidences of various diseases. (You could probably drop the day and just have month, but there could be cases where there were more hospi…
I'd argue that the first half of the postcode and month of birth are ample for outside-HSCIC use. Monday-deaths is the kind of thing that's done internally anyway.