Advisers say early action could save later, tougher measures to stop the spread of coronavirus.
Fewer adults are practising social distancing than think it is important, figures for Great Britain show.
It may be more contagious than Delta, but there is no evidence yet that it causes worse illness, experts say.
Five fire crews are on the scene of a blaze which sent smoke over the surrounding area.
Ali Harbi Ali, charged with the murder of Sir David Amess MP, appears via video at the Old Bailey.