 Benson's "History of Gresham's School" notes that — 

Shaw was an inspector of music in London schools from 1911 to 1940, simultaneously holding several posts as an organist, and in 1920 was his brother Martin's successor as organist of St Mary's, Primrose Hill, remaining there until 1930.He was also Inspector of Music to the Board of Education from 1928 until his retirement in 1942.For some years he chaired the BBC's schools music sub-committee.