How do I know if my Osteopath is legitamate

The title ‘osteopath’ is protected by law. It is against the law for anyone to call themselves an osteopath unless they are registered with the GOsC.
You can check if an osteopath is registered or not by visiting

OSTEOPATH REGISTER

Here you will be able to find out details about the practitioner, including their registration number, year of qualification, year of registration and contact details.