Time Out says
Certainly the strangest Hammer film ever made, this combines apocalyptic sci-fi, teen rebellion, and portentous philosophising to awkward but riveting effect. Set, strangely but successfully, in Weymouth, it begins as a rather mundane romance, with Carey and Field threatened by local Teddy Boys, before spiralling into a dour mystery about a scientist's experiments with radioactive kids. The performances are universally weak, and Losey's clearly ambivalent attitude towards the demands of the genre ensures that the film is never exciting. But as an ambitious oddity, it exerts not a little fascination.