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.
