This is 233 High Holborn, rather ordinary looking now but once "a pioneer work of the Modern Movement in England, the office block has good claim to be the first office block in England inspired by the International style." (From its listing).
It used to look more like this:
The architect was Frederick Etchells, once a Vorticist, later a restorer of churches. It was built, in 1930, for Crawford's Advertising Agency, perhaps the first British advertising agency to truly embrace visual design, echoing modernism and futurism and for many years the home of the legendary Ashley Havinden.
He did this:
But he is perhaps most famous for being the 'creative director / designer' behind almost all of the advertising for Simpsons and DAKS, one of the first examples of a comprehensive corporate identity - which Havinden called 'company handwriting'.*
The boss, William Crawford was, for his time, an enlightened employer of women saying "in no other occupation can men and women work together in closer harmony than in advertising". He famously employed the Sangster Sisters - Emily, Florence and Margaret. Florence was Managing Director and Finance Director, Margaret started as an Account Director and ended her career as a prominent figure in the history of British fashion, first Chairman of the Incorporated Society of London Fashion Designers.
So there we are.
Most of these facts and gleaned from 'Moving the Hearts and Minds of Men' Bill Crawford Ad Man by Ruth Artmonsky.
(*Also employed by Crawfords to work on Simpsons - Feliks Topolski.)