The distinction that matters
A registration number in an advertisement can be copied or out of date. The distinction is between a current public-register entry rather than a screenshot.
How to interpret the details
The strongest check begins with the person's full name. Compare spelling carefully when several practitioners have similar names. If the booking service will not identify the person until the last moment, ask how you can complete the check before accepting the visit. A photographed certificate might explain training history, but it does not answer the current-status question. Save enough information to identify who attended; a clinic's general email address is not a substitute for knowing the individual provider.
An additional consideration
An appointment booked through a receptionist still involves a particular individual. Check again if that person changes. A register search is most useful close enough to the appointment to inform the current choice, rather than as a permanent approval stored years earlier.
A practical question
Does the name on the booking match the person and practice details on the register? The limit: registration is individual and is not transferable between coworkers.
Decision example
Hypothetical example: a marketplace lists several practitioners under one clinic name and the customer cannot tell who is attending. A useful next step is to match the practitioner, location and current authorization.
Sources & further reading
Sources support the factual background. Practical planning examples are editorial guidance; they do not establish a provider’s availability.