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During the ice age as all the water was stored as snow/ice around the poles this meant the water level was a lot lower than it is today, so there was a land bridge between continental Europe and the UK. After the Ice Age there was a large amount of sediment that was deposited between the English channel which allowed this possibility as well, however as this was mainly clay and other fine sediments this eroded quickly. You see some of this ice age sediment along the east coast which is why East Anglia has a problem with coastal erosion.
http://en.wikipedia.org/wiki/Prehistoric_Britain
Read the section on the lower palaeolithic.
Almost right. There was a glacier covering what is now the North Sea, which allowed one to walk from the Continent to England quite easily. As the Northern Glaciers retreated, the ice behind the dam melted and the dam failed, creating the English Channel. Apparently, the failure was so sudden and massive that it created deep gouge marks in the sea bed in the Channel, which can still be seen today.