The other reviews are pretty spot-on in assessing this as utter drek, but oddly nobody has mentioned the ludicrous scene in which Judy Geeson - worst actress of 1968 without a doubt - suddenly bursts into song. After a good hour (which seems like a lifetime) of Geeson's high pitched, twelve year old schoolgirl voice, she appears in a nightclub 'singing', only her voice has been dubbed by a Madeline Bell soundalike (for those who aren't familiar with Miss Bell, she is a husky voiced jazz singer of the Shirley Bassey type). A more unsuitable voice double for Judy Geeson would be hard to imagine! The only plus in the entire film is the great Diana Dors, injecting interest and style into a project sadly lacking in both departments.
Review of Hammerhead
