The Government won't rule out fining Brits for breaking the rules of the new test and trace programme, which has launched today.
The scheme is not compulsory and will rely on people doing their "civic duty", but there could be financial repercussions if they don't comply.
The strategy, which is intended to reduce the UK's coronavirus cases without extending the lockdown, means anyone who comes into contact with someone who tests positive for Covid-19 will have to self-isolate themselves for two weeks, even if they have no symptoms.
Even if they get tested and the result is negative, they will still have to stay home for 14 days. It will be aided by the NHS track and trace app, which is being tested on the Isle of Wight before launching