There were many styles of windows in houses in bygone decades such as the wooden casements with stained glass patterns at the top in the bay windows of 1930s semis; the (rather hideous) Crittall steel framed windows that were popular in the 1950s and 60s although they were first tried out on modernist houses of the 1920s; the sliding sash windows of Victorian and Edwardian terraces; and the first generation aluminium double glazing from the 1970s, before the UPVC double glazing salesmen posted a leaflets through the nation's letterboxes...