Jimmie/Jimmy/James Smith was Chairman of Sadler's Wells from 1947 to 1961.
From the content of the letters, he must have been involved (possibly as a pupil of Cross's) at the Opera School and did a collection for her.
Smith was also a trustee of the Covent Garden Opera Trust 1946-1950 and on the board until 1954 and 1955-57.
One letter dated 9 Sep 1955 mentions Cross's retirement from singing.
One manuscript letter is undated, regarding Violet Bonham-Carter, another is typescript and is regarding Stephen Thomas.