Thanks. I'll have a search. Although this is one reason that I don't develop film myself. I'm far too clumsy (and lack of space).
Just for the sake of discussion. Most of the images I've seen online about reticulation seemed to have a more uniform pattern, which is why this seemed odd. These two images were next to each other on the roll (or pretty close), yet one has the issue and the other doesn't. I had also wondered if it was something that the lab did when they scanned the film (although this is something I do have experience with and it seemed odd)?