Steps to clean up London :
(i) Large blocks of apartments were built.
(ii) Rent control was introduced in Britain during the First World War to ease the impact of a severe housing shortage.
(iii) Between the two World Wars (1919-39) the responsibility for housing the working classes was accepted by the British state, and a million houses, most of them single-family cottages, were built by local authorities.
(iv) Underground railways was built in 1863 which enabled large number of people to live outside central London.
