Most people lived as farmers/ agriculture in primary sector jobs. The population was majority in rural areas.
1970s
The Industrial revolution where people moved to the countryside to cities to work in factories (secondary jobs). This is called Rural to Urban migration.
Globalisation
Cities grew through urbanisation and offered lots of opportunities, however conditions could be rough. The cities built tightly packed terraced housing ( no garden, no garage) to cope with the population density. Factories were big pull factors for people.
1970s - Onwards
Machines began to replace people and things became automated during Margaret Thatcher's reign. This saw the start of de-industrialization and resulted in massive unemployment for coal mining industries and factory workers.
As factories closed, products became cheap overseas. These abandoned factories became derelict and encouraged anti-social behavior (crime). Only some cities created regeneration plans to renovate these spaces.
The UK saw a rapid increase of people in tertiary jobs that replaced factory workers. The UK is now HIC and world leader in finance, media, research and entertainment. We are now seeing a quaternary sector ; service jobs.