Just to sum it up for people looking:
The issue was I loaded the film backwards.
I have done a few rolls since and most have turned out pretty acceptably, apart from scratching and sticking issues.
I'm well on my way enjoying film. Here's a picture from a roll of HP5+ that had a bit of light spill onto it but I like the picture and managed to make it somewhat usable. FYI I did discover Rodinal and HP5+ do not play nicely