The UK's population increased by 1% in a year, mainly due to net international migration, the Office for National Statistics (ONS) has said.
The total population of England, Scotland, Wales and Northern Ireland grew from an estimated 67.6 million in mid-2022 to 68.3 in mid-2023.
The ONS said the extra 662,400 people amounted to an increase of 1%.
The numerical increase is the largest since comparable records began in 1971.
"Net international migration was the main contributor to population increase for all four countries of the UK in the year to mid-2023," it added.
Officials also said there were 16,300 more deaths than births across the UK during the period – the first time there has been "negative" natural change in the population since 1976.
This breaking news story is being updated and more details will be published shortly.
Please refresh the page for the fullest version.
You can receive breaking news alerts on a smartphone or tablet via the Sky News app. You can also follow @SkyNews on X or subscribe to our YouTube channel to keep up with the latest news.