Boris Johnson digs in as coronavirus travel scandal engulfs his controversial chief adviser

London: Boris Johnson has been engulfed by a scandal that threatens to claim the scalp of his most-trusted political lieutenant and undermine public confidence in Britain's coronavirus lockdown.

Dominic Cummings, a key architect of Brexit and Johnson's rise to power who now wields enormous influence as the Prime Minister's chief adviser, is under pressure to resign after he and his wife drove 400 kilometres from London to northern England in apparent breach of strict social-distancing rules.

Britain's Prime Minister Boris Johnson's senior aide Dominic Cummings outside his home in London.Credit: AP

Durham's acting police chief described the decision as "most unwise" and "frustrating and concerning" given other members of the public had sacrificed so much to comply with the unprecedented national lockdown.

But asked by reporters on Saturday whether the trip was a good look, Cummings replied: "I behaved reasonably and legally. Who cares about good looks. It’s a question of doing the right thing. It’s not about what you guys think."

He also chastised members of the media for not standing two metres apart when gathered outside his London home.

According to reports, Cummings later denied a claim that he broke the quarantine in a second trip.

Johnson and his most senior ministers have launched a major operation to save the polarising adviser from being forced out of Downing Street, arguing Cummings and his wife, Mary Wakefield, did not breach the rules because they were worried about the welfare of their young son and wanted to be near Cummings' elderly parents and sister.

The rules at the time said anyone with symptoms must not leave their home under any circumstances and should not visit family members for any reason, however Deputy Chief Medical Officer Jenny Harries did tell a press conference held before the trip that a situation where two sick parents were unable to care for a child might warrant an "exceptional circumstance".

Wakefield had coronavirus symptoms when the couple drove to Durham but Cummings did not, calling into question whether those exceptional circumstances existed at the time of the trip.

Cummings eventually developed symptoms and was bedridden for more than a week. Wakefield later wrote a piece for the Spectator describing the ordeal but never mentioned that they had left London for support. In the same piece, she wrote of emerging "from quarantine into the almost comical uncertainty of London lockdown".

Downing Street officials also told political journalists at the time that Cummings was off work and self-isolating "at home".

A later report said Cummings also made a second trip from London during the lockdown and was spotted near Durham on April 19, days after returning to London from his first trip. Cummings described that claim as "totally false" according to a report in the London Telegraph.

The scandal, revealed via a joint investigation by The Guardian and Daily Mirror, is a political danger for Johnson. The opposition and even some Tory MPs have said it shows one set of rules applies to political figures and another to the general public.

"It is intolerable that Boris’ government is losing so much political capital," Conservative MP Steve Baker wrote on Twitter on Sunday. "Dominic Cummings must go."

A senior member of the government's Scientific Advisory Group for Emergencies, Professor Neil Ferguson, resigned earlier this month after he was caught breaking the lockdown rules to meet a woman he was in a relationship with.

Many of the same ministers who blasted Ferguson rushed to defend Cummings in a volley of tweets on Saturday that threaten to undermine the country's public health messaging.

In an unprecedented defence of a government staff member by cabinet ministers, Chancellor Rishi Sunak, Health Secretary Matt Hancock, Foreign Secretary Dominic Raab, Attorney-General Suella Braverman and Cabinet Office Minister Michael Gove all said Cummings had done nothing wrong.

"Caring for your wife and child is not a crime," Gove said.

Dominic Cummings is a key figure inside Downing Street and trusted ally of Prime Minister Boris Johnson.Credit: AP

Johnson has given Cummings his "full support" however the situation is fluid and Cummings' future is in doubt.

Acting Durham police commissioner Steve White on Saturday described Cummings' conduct as "unhelpful" and "frustrating".

"Given the whole ethos of the guidance and regulations issued from the government was to reduce the spread, regardless of the reason, by travelling to County Durham when known to be infected was unwise," he said.

"To beat this crisis, we need to be selfless as millions have been."

Downing Street has claimed that "at no stage was Cummings or his family spoken to by the police about this matter" as was reported by The Guardian and The Daily Mail.

But a statement from Durham police said officers were told "that an individual had travelled from London to Durham and was present at an address in the city".

"Officers made contact with the owners of that address who confirmed that the individual in question was present and was self-isolating in part of the house," the statement said.

"In line with national policing guidance, officers explained to the family the guidelines around self-isolation and reiterated the appropriate advice around essential travel."

The Labour opposition has called for an inquiry into the affair and said Johnson must answer details about whether he knew Cummings had moved to Durham during the lockdown.

"The lockdown rules were very clear: if you or anyone in your household was suspected of having COVID-19 you must immediately self-isolate and not leave the house," the party said in a statement.

"However, the Prime minister’s chief adviser appears to believe that it is one rule for him and another for the British people. This will cause understandable anger for the millions of people who have sacrificed so much during this crisis."