(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 thorn single-family cottages. were built by local authorities. (iv) Underground railway was built in 1863 which enabled large number of people to live outside central London.