Well, I haven't got anything 100% definitive, but checking the electoral roll gave a Norma I. Findlay resident in London W11 with Michael Naylor-Leyland (obviously of the baronetical family; I'm not sure how many Michael Naylor-Leylands there are/ were, so that's not much help!); checking birth records I found a Norma I. PhoeniK, mother Vaughan, b. Kensington, 1963, and a marriage record for a John R. Phoenix and May E. Vaughan at Kensington in 1957, so I'd tentatively say these are the individuals in question, but not certain.
[N.b.- there were marriage records in 1977 (to Ian S. Alleyne- presumably not the same- 14 year old- individual!) and 1985 (to William R. Skerritt) for a Norma I. Phoenix, indicating, given the dates, there must be/ have been more than one- e.g. a Norma Hamill m. 1951, Lancelot Phoenix, which might explain later remarriages]. A few hints, anyway, for someone with more details!