Doesn't need to be lengthy for the purpose of this though. I mean the pieces I need would be something like an inch square, perhaps a bit longer at most, so it doesn't have to do big pieces.
I converted the guides to roller bearings above and below the table, got everything really square, got the blade tracking nicely, and when I fitted a new blade it was a huge improvement overall between all the changes but still does it a bit.
Someone told me if you've ever cut a curve with a bandsaw blade it'll never track straight again so not sure how true that is, but I had done a lot with the previous blade. This one is thicker and deeper though so less prone to twisting.
Gonna go and have a play with it I think and using the modified mitre guide I did, or the fence, I'll see if I can get suitable pieces with a bit of messing.