Mainly after World War I, one of Europe's biggest industrial estates was constructed at nearby Park Royal, and large factories there and within Harlesden included McVitie & Price (later United Biscuits) from 1910, and Heinz from 1919. Industrial growth led to a middle class exodus as Harlesden turned entirely into a working class area in the inter-war period. The McVitie & Price factory became the largest biscuit factory in the western world, employing 2,600 people by 1978.
Mainly after World War I, one of Europe's biggest industrial estates was constructed at nearby Park Royal, and large factories there and within Harlesden included McVitie & Price (later United Biscuits) from 1910, and Heinz from 1919. Industrial growth led to a middle class exodus as Harlesden turned entirely into a working class area in the inter-war period. The McVitie & Price factory became the largest biscuit factory in the western world, employing 2,600 people by 1978.