Labour has demanded a “swift explanation” from Downing Street, after newspaper reports suggested Boris Johnson’s most senior adviser was spoken to by police over an apparent breach of lockdown restrictions.

A joint investigation by the Guardian and the Daily Mirror claims Dominic Cummings was approached by Durham Constabulary on 31 March after travelling to the city, which is more than 200 miles from his London home.

A Number 10 spokesperson had confirmed on 30 March that Mr. Cummings was self-isolating after suffering symptoms of coronavirus.

At the time government advice was that people should stay at home and not travel to second homes.

The newspapers also suggest a local resident saw Mr Cummings at the doorstep of his parents’ home with a child believed to be his son on 5 April.

A Labour spokesperson said: “If accurate, the Prime Minister’s chief adviser appears to have breached the lockdown rules. The government’s guidance was very clear: stay at home and no non-essential travel.

“The British people do not expect there to be one rule for them and another rule for Dominic Cummings. Number 10 needs to provide a very swift explanation for his actions.”

Breaches of lockdown restrictions have recently led to some high profile resignations.

Scotland’s chief medical officer Catherin Calderwood resigned from her post after it emerged she had twice visited a second home in Fife.

Professor Neil Ferguson, one of the government’s most high-profile scientific advisers, resigned from the SAGE committee after it emerged a woman from outside his household had visited his home on two occasions.

Downing Street is yet to respond to the reports related to Mr Cummings.

Sky News has contacted Durham Police for a comment.