What is the estimated population of the UK (to the nearest 5 million)?

The estimated population of the UK, as of recent figures, is approximately 68 million, which is closest to 70 million when rounded to the nearest 5 million. This rounded figure reflects the growth and demographic changes within the UK in recent years, including immigration and natural population increases. London and other urban areas significantly contribute to this number, showcasing the UK's diverse population landscape.

The other options are less accurate when considering current demographic data. While the populations of 60 million and 65 million may have been applicable in past years, they no longer reflect the recent trends observed. The figure of 75 million significantly overshoots the current estimates as well. Therefore, choosing 70 million is aligned with the most up-to-date understanding of the UK population.