OK, it has happened with C-41 film (kodak more then likely, about 12 months ago), HP5 back then and with Fp4+ on this occasion. I would tend to suggest that its not the film.
The C-41 was processed by a lab, but the Fp4 was processed by me on a reel.
I will use the camera again tomorrow (there is a film still in it) and see what happens. Interesting to note that it tends to happen towards the end of the roll. I think that if people think that its scratches, there must be something in the gate that is slightly touching the bigger the roll gets on the take up spool.