There is really not enough information in this @Guardian article to assess how severe the privacy issues are.

Sharing of NHS data should be carefully looked at and always as much transparency as possible #Covid19UK https://www.theguardian.com/world/2020/apr/12/uk-government-using-confidential-patient-data-in-coronavirus-response

Thanks to @nickdr92 for sharing this thread with me - which I think expresses some of my thoughts (but definitely don't agree with all) https://twitter.com/nickpickles/status/1249383736220610561?s=20