Ten years after it was made, I tracked this film down on Amazon. It never got much of a release in the UK and, as far as I know, it has never been shown on television. I'm not surprised. It is even worse than Woody Allen's other two British ventures: Match Point and Scoop. Everything I said about those two films applies in spades to Cassandra's dream: implausible plot, terrible dialogue and wooden acting. It employs a large number of fine British actors. I can only imagine how thrilled they were at being invited to appear in a film by the great Woody Allen and how shattered were their illusions after they had read the script. It was like a 1950's British second feature. Surprisingly, it lasts for 148 interminable minutes. Woody usually confines himself to a snappy 90 minutes. The kindest thing I can say about this film was that I never would have recognised that it was a Woody Allen film. There are a large number of 1 star reviews for this film on IMDb, most of them saying more or less what I have written here so there is not really anything else that I can usefully add.
Review of Cassandra's Dream
