ICU

Downing Street said he was moved to the unit on the advice of his medical team and was receiving "excellent care".

Mr Johnson has asked Foreign Secretary Dominic Raab to deputise "where necessary", a spokesman added.

The prime minister, 55, was admitted to St Thomas' Hospital with "persistent symptoms" on Sunday evening.

The Queen has been kept informed about Mr Johnson's health by No 10, according to Buckingham Palace.

World leaders - including US President Donald Trump and French President Emmanuel Macron - have expressed their support for Mr Johnson.

The 27-year-old New Zealander sustained a serious neck injury in the Premiership defeat to Saracens at Allianz Park on January 4.

Fatialofa underwent surgery to relieve the pressure on his spinal cord caused by bruising and swelling.

Worcester revealed on Thursday that the former Hurricanes forward has been moved from intensive care to the Major Trauma Unit at St Mary's Hospital in London.

A club statement said: "Michael's condition remains serious but he is making good progress and he is showing encouraging signs of improvement.