When the British started driving on the left

I’ve heard it said that the law about driving on the left in the UK began at London Bridge. Because it was so congested a thoroughfare, the Lord Mayor decreed that coaches should travel on their left. It was nice to find a book online that, although is not contemporary, it is close enough to the event that the author is still unaware of how important a decision it really was.

Reference:

London and its Environs Described (1761), vol 4, p134-135