It was Sir Patrick Vallance who said it, @Fyoosh posted it up:
“Our aim is to try and reduce the peak, broaden the peak, not suppress it completely; also, because the vast majority of people get a mild illness, to build up some kind of herd immunity so more people are immune to this disease and we reduce the transmission, at the same time we protect those who are most vulnerable to it.” — Sir Patrick Vallance.
It was Sir Patrick Vallance who said it, @Fyoosh posted it up: