If there was going to be a compulsory register, it would be illegitimate if some people got on to it just by dint of their membership of some other organisation which allowed members to renew with no test to their competence or fitness to work.
Unless you had inspectors that examined practitioner's working practices before being allowed to register, then it would be completely worthless and unable to "protect patient safety" as Jim Methven suggests.
To support the kind of infrastructure which had inspectors like this, would mean that any compulsory register would cost a fortune to start up. We'd have to pay more than people who actually treat patients, and therefore the whole concept is ridiculous.
