What are the minimum requirements for passing medical for PPL? Where can I find the UK requirements to pass the medical exam for a PPL?

Basically I would like to check my health and all the requirements with any doctor - I have health insurance plan, and when I know that I meet all the criteria I go back to the aviation doctor for checking and issuing the certificate.
The UK aviation medical standards are available online, so I assume you could go to any doctor with that information for a checkup.