I don't think the fork tubes were bent. As you could spin the tubes and it would have been immediately obvious. So, I thought it must be the yokes. Well, I had a new CNC top yoke ready to go on for fat bar conversion, so I decided to order another bottom yoke (secondhand from the UK - thanks caps!).
Next problem, that tube doesn't look right:
One tube didn't look too health with a nice dent in it. I'm starting to think the bike has been in an accident, and it doesn't get much better. Before long I found the issue with the steering headstock. Seeing as I'm replacing the bottom yoke and steering stem I figure I'm might as well replace the bearings. Then I find this:
The steering stem is out of round. Obviously, somebody has had a go at repairing it. A few dodgy attempt to re-weld which looks a lot like cheese with a shim jammed in the side to hold the bearing! Not good!!! After a lot of back and forth I think the frame really needs to be replaced. Yah! More unexpected stuff to buy! Initially I was thinking to have it rebored with a spacer ring inserted, though too many people were saying it could be out of alignment and the dodgy welding probably hasn't done the frame any favours.
Now looking for a new frame!