Prime Minister Boris Johnson imposed a full lockdown on London and large parts of southeast England in a desperate attempt to stop a new strain of coronavirus that is spreading rapidly in the U.K https://t.co/471GNgRHa2 via @bpolitics

— Joan Small (@JTracySmall) December 19, 2020

Here is a list of Tier 4 areas:

-London
-Kent
-Buckinghamshire
-Berkshire
-Surrey (excl Waverley)
-Gosport, Havant, Portsmouth, Rother & Hastings
-Bedford, Central Beds, Milton Keynes, Luton, Peterborough
-Hertfordshire
-Essex (excluding Colchester, Uttlesford and Tendring)

— Rupinder K Gill 💛💙🇺🇦 (@RupinderKGill) December 19, 2020

Areas currently in tier 3 in south-east England, including London, will enter tier 4 from tomorrow morning

PM Boris Johnson says tier 4 "will be broadly equivalent" to November's lockdown

Latest updates: https://t.co/VQFVN57a0p pic.twitter.com/ogyc8WiQ10

— BBC News (UK) (@BBCNews) December 19, 2020

On Wednesday, Boris Johnson said it would be "inhuman" to cancel household mixing plans for Christmas.

Four days later, the PM has placed London and large parts of the South East into new Tier 4 restrictions, forcing millions to cancel festive plans.https://t.co/4SJPcRFcKJ pic.twitter.com/2bNrGbQrsQ

— Sky News (@SkyNews) December 19, 2020

If they didn’t want this new variant to get out of London, it’s just found a possible new route. It’s called the train line to the East Midlands from St Pancras station tonight … 👇 pic.twitter.com/hIPOMG7Bex

— Chris Ship (@chrisshipitv) December 19, 2020

Scores of people trying to leave London tonight, just hours before the region is put on lockdown pic.twitter.com/u5UwvVRYFe

— BNO News (@BNOFeed) December 19, 2020

Chaos as hundreds cram onto last trains out of London before Tier 4 hits https://t.co/J1YteuAK3b pic.twitter.com/Q2IehzBngS

— The Mirror (@DailyMirror) December 19, 2020

Covid: Video shows crowds of passengers cramming in to train leaving London ahead of Tier 4 lockdownhttps://t.co/glJdVk2Tjm

— ITV News (@itvnews) December 19, 2020

🔴LIVE: Violent arrests continue – London Police
ANTI LOCKDOWN PROTEST – LONDON
Watch now: https://t.co/clKMgthBn8#LIVE #Livestream #Protest #Antilockdown #London #Freedom #arrest #arrested #Violence #violent pic.twitter.com/o9WNUVKriy

— Subject Access (@subjectaccesss) December 19, 2020