The idea
The freedom of movement within the EU may sound good in theory, but to allow uncontrolled immigration between member countries places unpredictable strains on resources here as Britain has effectively lost control of population movement.
Why is it important?
It is alarming to see the amount of land now being swallowed up by high density housing estates. Think of the population of the EU as beans on a tray which is balanced centrally. If the beans are blown around more will flow to one side or another till the sheer weight of numbers throws the tray off balance. This is what happening with migration within the EU.
Britain, especially England, is already one of the most densely populated countries in Europe and unless we regain full control over all immigration the situation will only get worse.