//Of he doesn't need a ventilator (and it seems he doesn't) he shouldn't be in ICU, taking the place of a regular person who actually does need one.//
Dr Simon Clarke, a microbiologist at the University of Reading, told Sky News the prime minister was probably being supported with fluids and is likely to have received oxygen to help his breathing.
"The NHS, particularly at this moment, doesn't give up intensive care beds just for people to be looked over - it doesn't work like that, even for prime ministers," he added.
"He would not be in intensive care unless he needed to be in intensive care, especially not at this time."