Lucette Marimar's debut.
It is established that Pat Dryden lives in "Myrtle Mansions" as the name is clearly seen on the outside of the building (which is actually Hammersmith Town Hall). When Deering calls Detective Inspector Bliss he mistakenly gives Pat's address as "20 Milstrom Mansions, Kensington". When Deering later accuses Bliss of being "late again", Bliss blames it on the traffic and counters by saying that: "We should have been quicker, if you had got the address right". The scene immediately cuts to a policeman who confounds the Inspector by calling for an ambulance to come to "Milstrom Place".
Office boy listed as David Greer who is of course known better as James Booth.