I had posted this on RFF earlier in the week without anyone being able to identify whats happened here with these strange marks. The best suggestion I've had to date was to send the results to Ilford for a response but in the meantime I would still like to see if anyone else can narrow down whats happened here.

The film shown is HP5, although I had similar issues on some rolls of FP4 developed recently. All the film was purchased new in 2004 and has been frozen since purchase but has been thawed out for a few days and refrozen 3 times due to moves. It is unlikely to be a camera issue as the FP4 and HP5 were shot in different cameras; and certainly not shutter marks on the HP5 as the camera had a leaf shutter. It also isn't due to any kind of double exposure. Any thoughts appreciated...