1960s1963B+Wblack and whitebuildersbuilding sitebuildingsconcreteconstructionconstruction crewengineeringequipmenthard workhousingimprovementlabourerslevellingLondonnewon-siteoutsidephysicalpost-warpouringpublic worksrebarsregenerationslab constructionstreetSwinging SixtiesterracesVictorianworking life