Covid-19: 'We will have a substantial third wave'

A Sage government adviser says we will have a substantial third wave, and opening up too soon would lead to an increase of infections.

Professor Andrew Hayward told Andrew Marr: "If we were to open up more that will just really fan the flames, and lead to this increasing even faster".

He said a single dose of Covid-19 vaccine only reduces the risk of infection by about a third.