London cabbies gaining the “Knowledge of London” will know have a seal of approval from City and Guilds.

To become a licensed taxi driver in the Capital, candidates must pass the Knowledge - an exam to prove that they have an in-depth understanding of London’s complex road network and places of interest. The system aims to ensure London's licensed taxi drivers remain amongst the most qualified in the world to get passengers from A to B.

Ken Livingstone said: "The Knowledge has a world wide reputation for producing highly-trained, professional taxi drivers, and now City & Guilds accreditation will provide an additional, independent seal of approval."

Chris Humphries, director general of City & Guilds said: "It's important for both drivers and passengers to know that the Knowledge is a sound training and examining system. It will give passengers peace of mind to know that the system has been independently assessed and approved."

Transport for London says drivers will notice no difference in the process of becoming licensed taxi drivers in London, except that from now on they will see the ‘Accredited by City & Guilds' logo on all Knowledge-related literature.