The last Ice Age, which came to an end about 12,000 years ago, swept the bands of hunter gatherers from the face of the land that was to become Britain and Ireland, but as the ice sheets retreated and the climate improved so human groups spread slowly northwards, re-colonizing the land that had been laid waste. From that time onwards Britain and Ireland have been continuously inhabited and the resident population has increased from a few hundreds to more than 60
million.
Britain .
