Due mostly to immigration, the UK's population is growing rapidly.
At the moment, the UK population is almost 63 million but, in 30 years' time, it will have overtaken Germany as the most populous nation in Europe (or, to be more precise, the most populous in the present EU).
Britain's population will soar by the equivalent of a city the size of Leeds every year for the next decade, according to official figures.
Over the next ten years, the population is expected to rise annually by 491,000, about the same as a city the size of Leeds.
In 2009, the UK accounted for a THIRD of the EU's population growth. Germany's population is shrinking and France's is growing but more slowly than Britain's.
Numbers will reach 70million in 2027 and 73.2million in 2035. In the same year, Britain will overtake France for numbers, and Germany, where low birthrates have resulted in a falling population, will be matched by 2043. The land area of Germany is 137,000 square miles – almost 50 per cent larger than the United Kingdom at 94,000 square miles.
England will experience the biggest population growth within the UK, with Scotland growing more slowly. Wales and NI will actually experience a fall in population.
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From The Daily Mail:

The UK is on course to becoming the largest country in the EU
Revised statistics show numbers rising at a sustained pace not matched for 100 years. And the main factor behind the increase is immigration. The projections suggest that, in just over 30 years, Britain will overtake Germany as the most populous country in Europe.
All estimates produced two years ago have been revised heavily upwards in a report published yesterday by the Office for National Statistics. Over the next ten years, the population is expected to rise annually by 491,000. Leeds’s current total is 486,000.
Most will live in the already-crowded South of England.
It is predicted that the landmark total of 70million – a figure the immigration minister in the last Labour government said would never be allowed – will be reached in the middle of 2027. This is two years earlier than previous reckoning. Two thirds of the overall growth in numbers, says the ONS, will be brought about either directly or indirectly by migration.
In the long term, net migration – the number added to the population every year through arrivals from abroad – will continue to run at 200,000 a year, the ONS said. This level, some 20,000 a year more than was predicted two years ago, is more than double the net migration that David Cameron has promised will be achieved by Coalition curbs.
The revised estimates come at a time of deepening concern over the effects of fast- rising population on housing, transport, water, power and state services such as education, health and welfare benefits

Read more:
http://www.dailymail.co.uk/news/article ... z1bzDzdyD8http://www.telegraph.co.uk/earth/earthn ... llion.html