Great Britain with a population of 100 million?

Are there any scenarios you can think of where the present population on the island of Great Britain would be near or over the 100 million mark? Perhaps starting in the mid-1700's.
 
Are there any scenarios you can think of where the present population on the island of Great Britain would be near or over the 100 million mark? Perhaps starting in the mid-1700's.

Failed D-Day. The USSR takes Germany, France and Italy and pushes the Iron Curtain to the English Channel. Huge refugee flows head to the UK, increasing poverty in Britain and thus pushing up the birth rate. When the Soviet Union finally collapses, the rest of Europe becomes free but still poor, and we get Polish style migrations from Western Europe too.
 
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