Demands are growing for the PM to ramp up controls after extraordinary images emerged this morning of still-packed Tube trains in London – regarded as the engine of the UK outbreak.

After a weekend in which crowds flocked to parks and landmarks to take advantage of sunshine, Mr Johnson effectively put the nation on its final warning last night, saying there should be ‘no doubt’ he would take draconian action.

Health Secretary Matt Hancock underlined this morning that a decision is expected ‘very soon’, hitting out at ‘selfish’ behaviour and saying ‘nothing is off the table’.

He pointed to measures in Italy and France – where all municipal spaces have been closed, forms have to be filled out to leave the house, and police are on patrol handing out fines.