From the 7 December, all travellers to the UK aged 12 and over need to provide proof of a negative PCR or lateral flow pre-departure
Very helpful member
From 04.00am on Tuesday 7 December, all travellers to the UK aged 12 and over need to provide proof of a negative PCR or lateral flow pre-departure test taken in the 48 hours before they travel, regardless of vaccination status.
https://www.forbes.com/uk/advisor/travel-insurance/what-are-rules-about-travelling-back-to-uk/