Key dates in scandal

Strict lockdown rules come into force across UK.

Boris Johnson and Health Secretary Matt Hancock are confirmed to have tested positive.

Claims Cummings has symptoms.

No10 confirms the PM’S chief of staff is self-isolating.

PM’S spokesman says Cummings is “at home, he is selfisolating, he has some symptoms”. Police speak to Cummings’ family in Durham after report he drove there.

Cummings spotted outside his parents’ property by neighbour. Scotland’s Chief Medical Officer Catherine Calderwood resigns after being caught visiting second home. PM taken to hospital and admitted to intensive care the following day.

It emerges Robert Jenrick travelled 150 miles from London to his £1.1million mansion in Herefordshire. No10 defends Communities Secretary, saying he was bringing his parents food and medicine.

Witness Robin Lees says he saw Cummings at Barnard Castle, Co Durham, with wife Mary Wakefield on her 45th birthday. PM released from hospital.

Cummings is pictured returning to work at No10.

Cummings was back in Durham according to walkers in Houghall Woods. No10 denies it.

Wife Mary writes article about family emerging from isolation “into London lockdown”.

The PM returns to work. Prof Neil Ferguson resigns after breaking rules to see lover.

Mr Johnson tells nation people can meet one person from another household, in public only.

At his Downing Street briefing PM again states those with symptoms “must stay at home”.

Government guidance states you cannot go and stay in another property.

No10 say just after 11am:

“At no stage was he or his family spoken to by the police.” At 8:52pm Durham Police release statement saying Cummings’ father confirmed to them that his son had travelled to self-isolate in part of property.

Mr Lees tells police of a possible sighting of Cummings, wife and son at Barnard Castle approaching a car. He writes: “I assume you are able to view CCTV to ascertain whether this vehicle travelled locally or further away.”