Will there be a circuit breaker lockdown in England?

The Government recently implemented a new three-tier system which separates areas in the UK into different categories of Covid risk – Medium (tier one), High (tier two) and Very High (tier three). Each local area will have to follow the designated rules for their tier. It is hoped that areas with a higher number of cases will see a drop from the tighter restrictions of a higher tier, with the aim to avoid a national lockdown. But as pressure mounts to consider a ‘circuit-breaker’ lockdown – with a leaked letter suggesting Wales will enter a 17-day lockdown from Friday October 23 – what are the odds that Boris Johnson will place England under one? Could England go into a two-week lockdown if the tier system doesn’t work?