Matt Hancock is due to announce changes to Covid-19 tiers in the House of Commons tomorrow.
The Health Secretary will reveal whether restrictions in local areas are being toughened or eased for the final time in 2020.
MPs are returning to Westminster tomorrow for one day in order to vote through Boris Johnson's eleventh-hour Brexit deal.
The vote is expected to take place around 2.30pm, with announcements about tier changes expected at around 3pm.
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The Prime Minister is expected to discuss new tier arrangements at a Covid-O meeting later today.
The government created the strict fourth tier in response to a new, highly contagious variant of the virus that is spreading in the South East of England.
17 million people were plunged into tier 4 when it was first created, then an additional six million people were added as new areas joined the "stay at home" tier on Boxing Day.
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The top level of restrictions now affects 24 million people, representing 43% of the population.
Essential guide to the new English tier system this Winter
The Government said there would be a tier review on a fortnightly basis, and the government will move areas depending on how they're coping with the virus.
But with the situation changing so rapidly, the government may decide to move places from tier to tier before the official review date this week.
Areas including Oxfordshire, Norfolk and Suffolk went into tier 4 on Boxing Day as part of the government's efforts to control the spread of the new, more easily spread strain of Covid-19.
Do you think the tier system is working in your area? Let us know in the comments section below