UK: population density map and data

Just 6% of the UK's land mass is made up of 'intensively built-up' areas and is inhabited by 75% of the population. The remaining population live mostly in 'moderately built-up' areas which make up 34% of the land mass, leaving over half of land mass containing very few people.
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Population density (People per km2)
 <1  1-5  5-25  25-
 250-1000  >1000