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Is there any scenario in which a mass migration from the British Raj to the British Isles is possible in the early 20th century? Something akin to a labor shortage in the Isles creating a natural flow of migration, or even some national effort towards such by a government.

In my mind, the only way for it to happen on a large enough scale is for Britian to experience a labor shortage during the late 19th and early 20th century, and for a solution to be found in labourers from the Raj; and from there it spiraling into a mass migration.

Is the precondition for a labor shortage possible? Are there other ways in which a mass migration can manifest? If you wish to expand further, what effects might such a migration have socio-economicaly?
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