The GMC website explains the process in more detail.
Most GPs will receive an email from the GMC four months prior to their revalidation date. This gives you a chance to ensure you have done everything you need to before the revalidation date.
There should be at least 2 clear months between your annual appraisal and your revalidation date, to allow the appraisals team time to do their administration tasks.
And you must have an appraisal within 365 days of your revalidation date.
Contact your appraiser to rearrange your appraisal date if necessary.
The appraisal team will contact you if there is any outstanding information required.
Most GPs will receive an email shortly after their revalidation date stating they have successfully revalidated.
For most doctors, their revalidation just happens without having to do anything special, as long as they have engaged with regular appraisals and done their patient survey and their colleague survey.