[OwenMorgan]

If you re-scan them competently, you're likely to get decent images, particularly from the second one. I don't see the blue lines you're talking about, but can you see a matching yellow streak on the negative? If not then it's a scanning artifact.

Thank you, and thanks everyone else who has replied, lots to learn but at least people agree that the scanning is certainly bad

The blue lines are actually on the 2nd one, not the 3rd as I said, and they do appear on the negative. By the end of the film its very bad. Could this be a mechanical thing, damage caused by winding on or similar? These were shot using a Rollei 35, but my previous rolls in this camera seemed fine...

To be certain though, I think I should start off with buying some new, decent film and ignore the big pile of cheap stuff I have aquired for now!