The need for Covid-19 vaccines for children is "being looked at", according to the government's chief scientific adviser.

Sir Patrick Vallance said at a press conference on Monday there was "no evidence the virus is going to mutate to specifically affect children", in response to a question posed by Matthew from Norwich.

He said: "What may happen is more people become immune to the virus through vaccination, so the virus may try to escape the vaccine. That's a normal process.

"Over time it may be necessary to update the vaccines, and maybe every couple of years it might be necessary to have a slightly different vaccine for certain vulnerable groups.

"In terms of vaccines for children, that is being looked at. I expect to see more trials of vaccines in children in the coming months."

England's chief medical officer Prof Chris Whitty added: "You'd want to be absolutely confident that a vaccine was highly safe for children, as children are at relatively low risk."