A copy (and transcript) of the diary of Caterina Pietra Giles, entry for 23 October 1923 about BSP’s childhood adventures.
An extract from Esme Howard, Lord Howard of Penrith, ‘Theatre of Life’ (1936) with notes made by Russell Poole (April 2002) from Lord Howard’s autobiography concerning the period of BSP’s attachment to the British Legation in Stockholm as his private secretary 1916-19.