Many houses were declared 'slums' and although a lot were demolished in Hockley, Planners soon realised they ere knocking down faster than they were rebuilding, so ceased demolition as they neared Lozell's and introduced the 'Envelope' scheme.
Terraced 'slum' houses were Reroofed, had damp proof courses put in, bathrooms with indoor toilet built above the kitchen extension, re-wired & where necessary re-windowed.
These houses are still there today after another 50 years.
Pity they hadn't the sense to start with that scheme before wholesale demolition - but it was the era of old is bad - new is good.
Incredibly a lot of the blocks of flats built at that time have been demolished themselves now - 50 years is very short term replacement housing, when with a fraction of the cost, 150 year old terraces are still going strong!
Brian