Hi
I can't help with the Limited Reg as I am currently trying to sort it out my self, but I understand before a person can have limited reg they have to undertake the written exam. then they can apply for the limited reg and work under the supervision of another physio.
I agree with your last comment about the Austrian PT's able to work in the UK, and UK PT's needing to do months of expensive exams, so we can work with them.