UK citizens: phone or write your MP to insist that any register of who has visited a pub or restaurant be stored offline, in that place, to prevent the state from using it for other than the ostensible purpose. Each day's records should be sent separately when needed; if contact tracers inquire about June 5, they should not receive data about June 4 or June 6.

You may wish to add that you do not trust Boris and Dominic to follow any rules they may make about use of the data.

Please spread the word!