The Prime Minister will on Monday morning chair his first meeting of the Covid-19 “war cabinet” since he was taken to hospital more than three weeks ago, and is ready to resume his role hosting televised Number 10 press conferences.

The Prime Minister has told aides to schedule catch-up meetings with individual Cabinet ministers this week to get fully up to speed after recovering from Covid-19.

The Prime Minister was admitted to St Thomas’ Hospital on April 5, and was discharged a week later and permitted to travel to his countryside residence with fiancee Carrie Symonds.

The Telegraph understands that Mr Johnson tested negative for the disease shortly before leaving hospital, meaning that he is now likely to have developed immunity.

Mr Johnson, 55, was taken to hospital on April 5, after confirming he had the virus 10 days before. He spent three nights in intensive care before returning to a ward.

Mr Johnson tested positive for Covid-19 on March 26. The Prime Minister had mild symptoms, including a continuous cough and high temperature, and so was advised by the Chief Medical Officer to get a test.

Then, on April 5, he spent the night in an NHS hospital after being admitted with persistent coronavirus symptoms. His doctor insisted the admission was a precautionary measure.

But Downing Street announced on April 6 he had been moved to intensive care after his condition worsened. He was given oxygen after suffering breathing difficulties but was not placed on a ventilator.