250 years ago, between 1764 and 1756, Leopold Mozart brought his eight-year-old Wolfgang and his sister Nannerl to London. They gave concerts and entertainments to wealthy benefactors throughout their stay. It was also at this time that young Wolfgang made friends with J.S. Bach’s own son, Johann Christian. This lecture looks at the relationship of the Mozarts, their impact on London, yet it also discusses the fickleness of the time that led them to leave London and England to seek new pastures in which the Mozart brand could be sold to new and eager audiences.