Mandatory licensing for drivers came into force on 1 January 1904 after the Motor Car Act 1903 received royal assent in the United Kingdom. Every car owner had to register their vehicle with their local government authority and be able to prove registration of their vehicle on request. The minimum qualifying age was set at 17. The licence gave its holder' freedom of the road' with a maximum 20 mph (32 km / h) speed limit. Compulsory testing was introduced in 1934, with the passing of the Road Traffic Act.

When was it required to have a driver's license? Let's have some stream of consciousness first.
To answer this question, we should know that: Mandatory licensing for drivers came into force on 1 January 1904 after the Motor Car Act 1903 received royal assent in the United Kingdom. So, the answer is 1 January 1904.