There were eight waves of migration from continental Europe to the British Isles, the scientists say. Each migration attempt occurred when ice sheets retreated northward and the climate became warmer.
The ancient humans ventured to Britain during periods of low sea level (when much of the water was locked up in ice sheets), strolling across land bridges that now lie underneath the English Channel and parts of the North Sea.
But during harsh glacial periods, ice sheets traveled as far south as London, defeating the first seven invasions.
Kind of an update on an earlier story.