>laid the foundations for modern Britain

Some stats to consider:

The working population of Britain was about 20 million after the war. The Windrush immigrants were estimated to be around 500k between 1948 to 1971.

So thats 25k per year give or take vs 20 million

There were 191,000 NHS nurses in the 1960s, 5,000 of them were from Jamaica (thats 2.6%)