Nurse Crane's stated credentials of 'SRN, SCM' stand for State Registered Nurse, State Certificate of Midwifery.
The show Sister Monica Joan watches outside the seaman's mission is Steptoe and Son (1962).
Lucy Chen refers to her Chinese father having been deported in 1946. This refers to the deportation of Chinese merchant navy seamen (principally based in Liverpool). The deportations are referenced under the name Home Office 213/926 "Compulsory repatriation of undesirable Chinese seamen". Approximately 2,000 men were deported to China, including approximately 300 who had married British women. The forced deportations were conducted with secrecy and the wives and children remaining in the UK were, in many cases, not informed of what had happened to their husbands and fathers. An internal government investigation into the deportations was carried out in 2022.