English architects did not seem ready for Corbusian modernism in the 1930s, but many emigres to our shores both built or inspired some rare inter-war modernist housing blocks. The defining features (which do not all have to be present) are:

Crittall windows in horizontal format

Deck access balconies

Plain elevations with very little decoration or detail

Flat roofs

White render finish

Anonymity of building type (could be a factory e.g.)