The Beatles - A Day in The Life: June 9, 1967
Studio Two, EMI Studios, London
"You Know My Name (Look Up The Number)" was first collated into something resembling the final form during this 7:00 to 11:00 pm session, with the editing and mono mixing of its various parts into one whole. This mix was then copied across to one track of a four-track tape ready for vocal over-dubbing.
Source: The Complete Beatles Chronicle - Mark Lewisohn