Surely Geoff as an 'old soldier' you had to conform in the past. Perhaps that is the real issue here (i.e. to conform or not to conform). If you don't wish to conform now, then that is entirely your choice. Exactly as it is the 'authorities' choice to head toward registration. With regards to your numbered points:
1. I suspect that they would be treated the same way as any person who attempted to practice as an unqualified Radiographer.
2. I would hope that they have to qualify in the same way as UK Radiographers do.
3. Try becoming a non-conforming Radiographer/Nurse etc and see what happens. Would love to see the Human Rights defence used.
The point is this - registration (in whatever form) is going to happen sooner or later. Fighting against it is a complete waste of time and effort. You may not like that fact, but the fact is still true.