Population density i suppose can be used to prove anything you want it to prove. If you think the UK has a high population density, you can prove that, if you think the UK is not overcrowded you can also prove that.
The following is taken from WIKI
" While population density is an objective measure of number of people living per unit area, overcrowding refers to people's psychological response to density. But, definitions of crowding used in statistical reporting and for administrative purposes are based on density measures and do not usually incorporate people’s perceptions of crowding."
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The interesting point is the Psychological response, if you are anti-immigration your psychological approach will be to prove that the population is overcrowding and that leads to a shortage of resources. (A UKIP/RW position) If you believe in open borders and immigration is not a problem, you can prove that overcrowding is not an issue and that resources are plentiful ( A Liberal position)
The Housing Act 1985 defines overcrowding as
324Definition of overcrowding.
A dwelling is overcrowded for the purposes of this Part when the number of persons sleeping in the dwelling is such as to contravene—
(a)the standard specified in section 325 (the room standard), or
(b)the standard specified in section 326 (the space standard).
325The room standard.
(1)The room standard is contravened when the number of persons sleeping in a dwelling and the number of rooms available as sleeping accommodation is such that two persons of opposite sexes who are not living together as [
F1a married couple or civil partners] must sleep in the same room.
(2)For this purpose—
(a)children under the age of ten shall be left out of account, and
(b)a room is available as sleeping accommodation if it is of a type normally used in the locality either as a bedroom or as a living room.
326The space standard.
(1)The space standard is contravened when the number of persons sleeping in a dwelling is in excess of the permitted number, having regard to the number and floor area of the rooms of the dwelling available as sleeping accommodation.
(2)For this purpose—
(a)no account shall be taken of a child under the age of one and a child aged one or over but under ten shall be reckoned as one-half of a unit, and
(b)a room is available as sleeping accommodation if it is of a type normally used in the locality either as a living room or as a bedroom.
(3)The permitted number of persons in relation to a dwelling is whichever is the less of—
(a)the number specified in Table I in relation to the number of rooms in the dwelling available as sleeping accommodation, and
(b)the aggregate for all such rooms in the dwelling of the numbers specified in column 2 of Table II in relation to each room of the floor area specified in column 1
No account shall be taken for the purposes of either Table of a room having a floor area of less than 50 square fee
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Again from WIKI
"Human overpopulation (or population overshoot) is a
state in which there are too many people,
consuming too much, for the
environment to sustain (with food,
drinkable water,
breathable air,
etc.)"
Every new technological age of advance, from the Agrarian to the industrial revolution has brought about population explosions because we can carry more food and eat more food because we grow more food.
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Can you argue then that overpopulation is lack of food. If so then the most densely populated parts of the planet are those with famines.