I wondered about the tech china is using to monitor all people. I expect you have seen it but they have an app that gives you a red/amber/green status and you can only go into buildings etc if you are green. Status is based on who you have been exposed to. Every time you go in a building they check your temperature and that logs. It creates a network of who is infected and isolates them, and flags it to everyone who they have been in close proximity too. Problem is, being china it is a centralised system, government monitoring your movement, who you meet and your health - unpleasantness they wont give up fast. Felt like this distributed data should be held by individuals but with a centralised function, then your HAT gives the 'Im ok' signal or a 'Im not OK', and sends to your recent contacts, or via a central hub if you were in public. What is hard is to be able to work out how the hell that might work without a large central database that recognises you - my thoughts is some form of anonymous HAT-ID. A HAT solution would be GDPR compliant. Not sure if anyone in UK has developed this yet. A hackathon could build an MVP.
This appears more important given the fears of bio-surveillance that may arise.