The Small Back Room is a 1943 British thriller novel by Nigel Balchin, a pioneer of the use of computers, who later became Deputy Science Adviser (Army).
In 1947 it was adapted by the team of Powell and Pressburger as a film of the same title starring David Farrar and Kathleen Byron.
[1] Perhaps confusingly, this used the term Boffin to refer to back-room 'boys' rather than to those more like Nigel himself.
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