You are missing something Jim.
Paragraph 3.

"England has a population of 51 million and a land mass of 50,000 square miles and this gives a population density of a little over 1,000 per square mile. Excluding islands, city states, and dependencies, this still places us behind
Bangladesh
The Palestinian territories
Taiwan
South Korea
The Netherlands
England"


Our population density overtook Netherlands some years ago and "Palestinian Territories" is not a country.

So, your site puts us fourth if you count the island of Taiwan, and third if you do not, both of which justify my original aside.