@PaulSB You're implying that NOT to test when you have an illness that you think might be C-19 is irresponsible. Have I got that right?
If so every "socially responsible" person should make sure they have a supply of tests eg buy some more when the left overs (or the 'spare ones' from a pharmacy
@steverob ) have run out. If they can afford that.
Will you cut some 'responsibility' slack to those with a lack of disposable income with food, energy etc being more important to them?
If you were ill, why would you have "carried on as normal"? Surely the responsible thing is to take account of that illness, not go to work / pub if you think it's infectious. And as I said, that threshold will depend on the work or social activity and setting (eg medical, care, vulnerable individuals (and healthy little children are not), close interaction). I like
@geocycle 's approach: "the precautionary principle applies with any virus".
Do you see testing for C-19 is an expected action on feeling poorly for the rest of the decade, or longer?