I'm guessing that if a new film has been used outside of Mobberley, then it is getting processed somewhere, and therefore any results are being kept under-wraps as well.
If it's a C41 film in a plain cassette (like a white one, for instance, simply labelled "C41"), it can be processed by any lab and they won't know what it is. It'd look like it could be film from a disposable camera.



