From "The New York Times"
10 Nov 2014
When we first arrived in London with our 14 pieces of baggage and over a 1 hour ride from the airport, I got into a long chat with our very friendly "Black Cab" Driver and one of the things that we discussed was how it had taken him 3 years to clear the exams to get his "Green Badge" License. I was obviously impressed at the rigour of the course and the sheer volume of knowledge that each one of them had to memorise and internalise.
This article in the New York Times from last year goes into marvelous detail of the whole process and is a brilliant read.
The Knowledge, London’s Legendary Taxi-Driver Test, Puts Up a Fight in the Age of GPS