I saw this many decades ago and, apart from the "team of female codebreakers led by a genius" couldn't really remember much apart from the fact that I enjoyed it. Not the title, the fact that it's stuffed full of really quite famous people, nor much of the plot!
Having been directed to the correct title by the IMDB community (thanks!) and thanks to the wonder of youtube, I have now rewatched it. Sadly, I am now seeing more of the flaws that my memory had erased, although it was still fun and the basic setup quite interesting.
Despite Dirk's subsequent comments about being miscast, I think he fits the part very well, and makes quite a convincing "work" Sebastian. Sitting less comfortably was the "romantic" Sebastian - not just because of what we now know but also because of the of-its-time sexual politics (e.g. he slaps her during one argument and she is almost immediately kissing him again...). The rest of the supporting cast also do pretty well but the biggest issue for me this time was the soundtrack. I found it very intrusive, overly loud and really quite irritating at times.
I don't think I'll be watching it again, or recommending it wholesale - but for fans of the 1960s and Man-fom-Uncle-type capers it's still interesting.
Review of Sebastian
