Thanks for your suggestions with this. I should have said that the camera is an Ilford Envoy bakelite 6x9 model, from the 50's. It seems to have a simple meniscus lens and a curved film plane. I bought it on Fee-bay and found this film inside. I have just developed some roll film and did this film in ID11 1:1 at 20'c for 15m. A prewash in water ran dark yellow when emptied out. I was very surprised to find images on it. As has been mentioned here, the film has no marks in the border, all 4 images are very thin and quite soft.
For interest I have attached a scan here. The mini in the picture has a registration number which is pre 1963 (ish), possibly even very late in the 50's, so this picture probably could have been taken in the early to mid 60's. Mini's didn't keep their looks for long, therefore I would doubt that this picture was taken in the 70's, making this 35 to 45 years old?