Yeah its on several frames unfortunately, like a thin faint band. I need to inspect the negatives to determine if its on the negative or just the scan. I doubt its a scanner flaw though as its only on the last several frames of that roll I have seen this effect.
TBH I don't know how I feel about some of the odd defects you can end up with on film, I have seen tiny little 'holes' in the image many times, some times a little hair or two on B&W scans, on both C-41 and B&W sometimes odd little patches where it looks like the chemistry didn't work quite right. It was disappointing actually that on several frames of another roll there where large spots where the fix/wash stages haven't been done right, it surprised me as the first roll of B&W they did for me was so perfect it was like a mega clean dev and scan of C-41. Since I am shooting so much B&W now and have utterly fallen in love with Fuji Acros, just look at those tones! I should really look at getting the kit to dev and scan B&W myself.
I don't want to offend anyone but I have severely mixed feelings about C-41 colour, I have shot 3 rolls of Portra 400 now, some Ektar and several rolls of Agfa Vista and I think to be honest for colour I would rather use my M8. For B&W though its film all the way for me, just love it, its shots like the first one above, that is literally what the scan looked like when it came back me.