That photograph was published in THE EDGWORTH STORY by Gordon E Barritt which states:-
"The opening of the organ was also memorable because it was the occasion of the first official visit to Edgworth of the new Principal, the Rev John W Waterhouse. The photo caption reads
Friday, 13 September 1950
At the opening of the War Memorial Organ
Mr Reginal Foort, FRCO, Anne Chadwick, Soprano, with the then Governor Mr E J Milverton, the Principal at that time, the Rev John W. Waterhouse, and Mr Alan A Jacka.
Mr Waterhouse joined the NCH Executive Committee at Highbury in September 1944. Mr Alan A Jacka, OBE, MA was the NCH Education Secretary.