Well, the cheeftah was introduced by the Perspex company in 1968, quickly the company name changed to Lomart engine products.....they owned Clinton engine and thats what was sold on the bikes. So when searching for info search either Lomart or Cheeftah to find info on the bikes.
Here's the introductory literature for the Cheeftah, they later went onto to offer a few different versions including full suspension bikes as well.