Looks like from next week, so possibly Monday but no earlier
https://www.gov.uk/government/news/p...-november-2021
Targeted measures will be introduced
from next week as a precaution to slow down the spread of the variant while we gather more information. These are:
- All international arrivals must take a Day 2 PCR test and self-isolate until they receive a negative result.
- All contacts of suspected Omicron cases must self-isolate, regardless of their vaccination status. They will be contacted by NHS Test and Trace.
- Face coverings will be made compulsory in shops and on public transport from next week. All hospitality settings will be exempt.