[3] Flynn's first recorded professional fight, weighing in as a flyweight, was as a nineteen-year-old facing similarly inexperienced fighters in Kingston, Jamaica.

His first British fight was against Joe Kerr, a future Scottish Lightweight champion, winning by technical knockout in the second round.

In Britain Flynn was unable to challenge for any of the British belts, but was a popular attraction on boxing cards during his time in the country.

He fought at The Stadium in Liverpool, Earls Court Arena and both the National Sporting Club and Kelvin Hall in London.

Although no record of his interim fights is available, in 1954 Flynn re-appears on the boxing scene in a challenge for the British Honduras welterweight title against Rudolph Bent.