Sorry another tier question

[Hapixmas]

I assumed that the tiers change this weds. But have read on here that this isn't the case. What day will tiers change and where is this confirmed please?

I read that any changes won't come into place until Saturday

www.google.co.uk/amp/s/inews.co.uk/news/uk/tiers-change-will-before-christmas-areas-england-tier-system-when-review-date-covid-cases-787307/amp

Following a meeting of London MPs with health minister Helen Whately on Thursday, they said a decision about moving the capital into Tier 3 would be taken on 16 December, details published the day after and it would come into force from 19 December.

Review on 16th, announcement 17th, implemented from 19th