For those that don’t know, loads of counties were created in the 60s/70s (can’t remember exactly) to better represent the growth of cities. So we saw West Midlands (basically Birmingham + Wolverhampton), Tyne and Wear (Newcastle + Sunderland), Greater Manchester, Merseyside (Liverpool and The Wirral) and Greater London all get carved out of the historic counties (Middlesex actually just got almost entirely consumed by London).
For those that don’t know, loads of counties were created in the 60s/70s (can’t remember exactly) to better represent the growth of cities. So we saw West Midlands (basically Birmingham + Wolverhampton), Tyne and Wear (Newcastle + Sunderland), Greater Manchester, Merseyside (Liverpool and The Wirral) and Greater London all get carved out of the historic counties (Middlesex actually just got almost entirely consumed by London).
Obligatory Map Men link
It was the mid 1960s for London and the mid 70s for Birmingham. I think the rest of the country was also mid 70s.