Many thanks for the responses.
Having looked at many images on the Internet, I feel certain that you are correct about the Pterodactyl. The Image is too indistinct to be able to tie down the variant
Regarding the autogiro, I had thought that the airfield is in the UK, and although the Spanish roundals are much like the British in B & W, not sure what a Spanish aircraft would be over here for. Also, the rotor supports on the C6 are quite slender, those in the photo look sturdier but then the image very poor in respect of detail.
From their uniforms, what nationality are the service men?
Malcolm.