Wow, people on this board are really generous. I couldn't stop laughing at the unending silliness of this movie, from the bad stock /studio footage matching to Jeanne Crain's silent movie reactions to lions and rubber snakes to the under-cranking (fast motion) of the fight scenes. And when Dana Andrews flicks the branch of a bush into David Farrar's face a la The 3 Stooges that was just the comedic icing on the cake. I could have done better than that with my family out in the backyard.
Obviously the producers were taken with the (then recent) success of Mogambo, King Solomon's Mines and other exotic fare and thought they could cash in, but those movies had a decent script and flair--plus much more on-location shooting (essential for this kind of movie). Here absolutely nothing seems right, even the music, which breaks out in a Bach-like chaconne for the final chase through the jungle that effectively stifles whatever drama the scene might have had (not much really). No, there are some really decent B-Grade jungle/exotic location action movies, but none to my knowledge has ever been produced by a British studio. It just wasn't their thing.