If you click onto this link, it will take you to the Department for Transports Taxi and Private Hire Vehicle Best Practice Guidance from the 17th November 2023. 

https://www.gov.uk/government/consultations/taxi-and-private-hire-vehicle-best-practice-guidance/outcome/taxi-and-private-hire-vehicle-best-practice-guidance-government-response

What is interesting about the Government's response, is the subject of vehicle age limits.

Licensing authorities should not impose age limits for the licensing of vehicles but should consider more targeted requirements to meet its policy objectives on omissions.

We as a trade association are trying to get an extension on age limits for Southampton licensed vehicles.