Very interesting question, I had to do some research to find out (especially since the Brexit and UK is not included in Eurostat data anymore)

If we look at NL vs England

• NL has a density of 424 hab/km² (https://en.wikipedia.org/wiki/List_of_countries_and_dependencies_by_population_density)
• England has 434 hab/km² (https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/bulletins/annualmidyearpopulationestimates/mid2021#population-change-for-uk-countries)
• (the UK as a whole has 279)

This map shows the difference, in the NL it’s more spread while in England it’s focused on the big cities

Source: http://www.statsmapsnpix.com/2020/04/population-density-in-europe.html

This interactive map also shows the data: http://www.luminocity3d.org/WorldPopDen/#8/51.856/3.705