Police in Durham have released a statement suggesting Dominic Cummings "might have" made a "minor breach of the regulations" amid continued controversy.

The Prime Minister's top aide has been criticised for appearing to breach the government's own regulations intended to enforce the coronavirus lockdown.

But Boris Johnson has continued to defend Cummings, stating the adviser acted "reasonably and legally" due to concerns over how he would care for his young child if he and his wife were sick with the virus.

Durham Police has issued a statement to say Dominic Cummings will not face further action.

It said: "On March 27 2020, Dominic Cummings drove to Durham to self-isolate in a property owned by his father.

"Durham Constabulary does not consider that by locating himself at his father's premises, Mr Cummings committed an offence contrary to regulation six of the Health Protection (Coronavirus, Restrictions) (England) Regulations 2020. (We are concerned here with breaches of the regulations, not the general Government guidance to "stay at home".)

"On April 12 2020, Mr Cummings drove approximately 26 miles from his father's property to Barnard Castle with his wife and son. He stated on May 25 2020 that the purpose of this drive was to test his resilience to drive to London the following day, including whether his eyesight was sufficiently recovered, his period of self-isolation having ended.

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"Durham Constabulary have examined the circumstances surrounding the journey to Barnard Castle (including ANPR, witness evidence and a review of Mr Cummings' press conference on May 25 2020) and have concluded that there might have been a minor breach of the regulations that would have warranted police intervention. Durham Constabulary view this as minor because there was no apparent breach of social distancing.

"Had a Durham Constabulary police officer stopped Mr Cummings driving to or from Barnard Castle, the officer would have spoken to him, and, having established the facts, likely advised Mr Cummings to return to the address in Durham, providing advice on the dangers of travelling during the pandemic crisis.

"Had this advice been accepted by Mr Cummings, no enforcement action would have been taken.

"In line with Durham Constabulary's general approach throughout the pandemic, there is no intention to take retrospective action in respect of the Barnard Castle incident since this would amount to treating Mr Cummings differently from other members of the public. Durham Constabulary has not taken retrospective action against any other person.

"By way of further context, Durham Constabulary has followed Government guidance on management of alleged breaches of the regulations with the emphasis on the NPCC and College of Policing 4Es: Engage, Explain and Encourage before Enforcement.

"Finally, commentary in the media has suggested that Mr Cummings was in Durham on April 19 2020. Mr Cummings denies this and Durham Constabulary have seen insufficient evidence to support this allegation.

"Therefore Durham Constabulary will take no further action in this matter and has informed Mr Cummings of this decision."

Boris Johnson is standing by senior aide Dominic Cummings despite the Durham Police findings.

A Number 10 spokesman said: "The police have made clear they are taking no action against Mr Cummings over his self-isolation and that going to Durham did not breach the regulations.

"The Prime Minister has said he believes Mr Cummings behaved reasonably and legally given all the circumstances, and he regards this issue as closed."