[3][4] In 1894, after leaving Cambridge, Branson was articled to a firm of solicitors, Markby, Stewart & Co.

Writing books on the Stock Exchange helped to make his name as a young barrister, and he was Junior Counsel to the Treasury from 1912 to 1921.

[3] In 1916, Branson took part in the trial of Sir Roger Casement for treason, acting for the Director of Public Prosecutions as junior to F. E. Smith.

[7] He died on 23 April 1951. Who's Who reported that his address at the time was Bullswater House, Pirbright, Surrey.

Branson continued his interest in sport and was a lifelong member of the Leander Club.