Ah. So it seems there’s actually only one Pro Challenge (perhaps per skater), and it seems you don’t have to do a difficult Spine Transfer on Tony’s one to complete it. Once I’d figured that out, it was a pretty simple task to finish it off. And that’s game over, it seems.
Well, there is now Pro Tour open, so I went and had a go at that. Cleared most of the goals on the levels (except London), before turning it off. Might get some more tomorrow before moving on to THUG, I think.