We first encountered Crittall Windows when working on a flat in Astral House in Westminster, a classic expression of the Art Deco style (not far from the much-loved, and much-filmed, Regency Cafe).
Crittall windows are steel framed and are distinguished, in contrast to typical sash windows, by their repeating patterns of glazing bars and smaller panes.
The company, named for its founder Francis Berrington Crittall, is still going strong, long after its founding in Essex in 1889.