Letters and related enclosures sent to Sassoon from his mother Theresa ('Ash') Sassoon, over the course of many decades. The letters are mostly undated, although dates of many have been inferred. The letters are arranged chronologically where possible, and classmarks are continuous from MS Add.9877/1/1/1-245. A group of undated and undatable letters has been listed at the end, at classmarks /196-231. Classmarks /232-245 have been assigned to additional material, namely scraps of letters and loose photographs for which the original context is lost. Note that some letters originally had enclosures which are no longer extant and many include small sketches. Most are on notepaper headed 'Weirleigh' (Theresa Sassoon's house in Matfield, Kent). NB. Additional notes by the archivist on the dating of these letters can be found in folder marked MS Add.9877/1/1/1a.