The GPO film unit came into possession of sound recording apparatus to the tune of £3,000 in the spring of 1934 and set about experimenting with various techniques. 6.30 Collection was one of their first successes at recording an orchestra. The orchestra consisted of one film rewinder (operated by Stuart Legg), one trumpet, two typewriters (operated by office staff), one empty beer bottle (blown for a ship's siren), one projector (by the projectionist), some conversation, two pieces of sand paper (Arthur Elton), the studio silence bell (Grierson), a pair of cymbals and a triangle (Basil Wright). Walter Leigh arranged and conducted and the result was the title music for 6.30 Collection.