I am looking for an up to date list of say the largest 25 cities in the UK by population.
Searching around on Google, most lists seem to be a few years outdated, and some don't even specify last updated dates. Where is the most reliable source to find an up to date list of the largest cities in the UK by population?
Example from http://www.citymayors.com/gratis/uk_topcities.html which unfortunately doesn't specify a date:
London 7,074,265 49.12
Birmingham 1,020,589 49.42
Leeds 726,939 49.43
Glasgow 616,430 47.73
Sheffield 530,375 49.73
...
There are other websites such as http://worldpopulationreview.com/countries/united-kingdom-population/cities/ which also don't specify any updated dates ...