The date of composition of Arnold Trowell's Viola Sonata is not known precisiely, however, Trowell would've had contact with Lionel Tertis from at least 1917 until when Trowell was the cellist in Tertis's group The Chamber Music Players in 1922 and the early part of 1923. Stylistically the Viola Sonata has similar traits to the Violin Sonata op.24 published in 1918 by Novello. There is nothing documented about a performance of the work by Tertis, and John White's book on Tertis mentions the Sonata only as being associated with Tertis. A mention in The Strad could indicate that Tertis had performed it. The manuscript was in the hands of Robert Scott (https://www.oks.org.uk/news/remembering-robert-scott/) for several decades, from sometime in the eighties. He produced a manuscript copy of the Sonata with some passages written out in a different key signature, with the goal of simplifying some of the enharmonic spellings.