My attempt at a Stanley Bate catalogue :) There are considerable difficulties because Bate seems to have worked on several works simultaneously so that works took some years to complete. "Piano Concerto No.3" is a designation given to at least two separate works whose manuscripts are in the Library of the Royal College of Music. I am not sure of the exact nature of all those manuscripts which do still exist.
STANLEY BATE: A CATALOGUE OF THE ORCHESTRAL AND CHORAL MUSIC
c.1934: Symphony No.1 (withdrawn and destroyed)
Piano Concerto No.1 (withdrawn)
1935: Ballet "Eros"
Summer Idylle for chamber orchestra
1936: Overture
Two Preludes for chamber orchestra
1936-37: Violin Concerto No.1
1936-38: Concertante for Piano and String Orchestra, op.24
1937: Concertino for Piano and Chamber Orchestra, op.21
Suite for Oboe and string orchestra
1938: Sinfonietta No.1, op.22: 19 minutes + (Dutton cd)
Ballet "Juanita"
1937-39: Symphony No.2, op.20 (withdrawn but extant)
1938-39: Ballet "Perseus", op.26: 110 minutes
1940: Piano Concerto No.2, op.28: 25 minutes + (Dutton cd)
Symphony No.3, op.29 + (Dutton cd)
1943: Violin Concerto No.2, op. 42
Concerto for Two Pianos and Orchestra, op.43
1944: Sinfonietta No.2, op.39
Suite "The Fifth Year"
"Haneen"-Fantasy on an Arabian Theme for flute, gong and strings, op.50
1944-46: Viola Concerto, op. 46: 39 minutes + (Dutton cd)
Ballet "Dance Variations" (and orchestral Suite)
1946: Ballet "Highland Fling"
1947-50: Violin Concerto No.3, op.58
1951-52: Piano Concerto No.3, op. 66
1952: Concerto Grosso for Piano and Strings
1952-55: Concerto for Harpsichord and small orchestra
1953: Cello Concerto
1954-44: Symphony No.4: 37 minutes + (Dutton cd)
1955: Piano Concerto No.4 (lost?)
1957?: Incantations for soprano and orchestra, op.48
1958: Piano Concerto No.5 (unfinished)
and Suite for Violin and Orchestra
I posted before on an intriguing claim made by Bate's first wive, Australian composer Peggy Glanville-Hicks in the essay by Michael Barlow and Robert Barnett: "STANLEY BATE - Forgotten International Composer" published on Musicweb Internationational.
Near the end it says: "Glanville-Hicks claimed he wrote a dozen or more symphonies and thirty or so piano sonatas." Is there any more to be said about it? Does anyone know? :-\