Since 2020, the GMS contract mandates a requirement to have a practice website.  

The webiste must
– display information detailing your practice area, including the area known as the outer boundary by reference to a sketch, diagram plan or postcode
– display your CQC rating
– to meet website accessibility regulations

It is also important to remember that where any such website uses cookies to collect information about visitors and usage of the website or where the website reveals personal information about staff members working at the practice, the requirements of the General Data Protection Regulation (GDPR) apply.

Links
GDPR
Web Content Accessibility Guidelines (WCAG)