I am not related to Walter, but I did find this and thought it may help someone out.
Department of State, Foreign Service of the United States of America Report of the Death of an American Citzen
Place and Date: American Embassy, London, England, April 17. 1968 Name in Full: Walter Lawrence Tansley Occupation: Estate Agent Naturalized: at Los Angeles, California, 1/8/65 Last known address in the US: 2189 La Canada, Crest Drive, La Canada, California. Date of Death: April 4 10.30p.m. 1968 Age: 58 years Place of Death: 51 Lawrie Park Road, Beckenham, Kent, England. Cause of Death: Certified by C.M. Saunders, M.B., to be: la. Cercinomatosis b. Carcinoma of braonchus (R). Disposition of the remains: Cremated at Golders Green Crematorium, London, England, on April 9, 1968.Ashes scattered at crematorium. Disposition of the effects: In custody of Mrs. Irene B. Tansley, wife. Person or official reponsible of custody of effects and accounty therefor: Mrs. Tansley. Informed by telephone: Michael L. Tansley, 919 Dogwood, Costra Mesa, California, son, 4/5/68. Copy of this report sent to: Irene B. Tansley, 24 Russell Square, London, W.C.1, England, wife, 4/17/68. Residing abroad with relatevies as follows: Irene B. Tansley and Ernest Tansley, address as above, wife and brother. Other known relateves (not given above): herbert L. Tansley, 6 Stephen Close, Cowplain, Hampshire, brother. This information has beenplaced under File 234 in the correspondence of this office: Citizenship confirmed by Naturalization Certificate No. 869198 issed at the District Court of Los Angeles on 1/8/65 which has been endorsed and returned to widow.Details of death confirmed by Certificate copy of Entry of Death No. 117 issued in the Sub-District of Beckenham, London Borough of Bromley, showing death registered on 4/5/68. Signature on all copies: Huston Dixon, Consul of the United States of America.