John Barry conducting the orchestra for You Only Live twiceFrom the back (horns etc.) going down to the front, from left to right:

3 (horn) 4 (horn) 5 (horn) 6 (horn)
Jim Burditt Andrew McGavin Ian Harper John Burden
7 (flute) 8 (flute) 9 (flute) 10 (flute)
? Chris Taylor   Jack Ellery David Sandeman
11 (?) 12 (?) 13 (oboe) 14 (bassoon)
? Terence MacDonagh Ron Waller Tony Judd

In the strings section on the right-hand side of the photo:

Front row:

1    2    3    4    5
Sid Sax
(orchestra leader)

Paul Shurman Alec Firman Erich Gruenberg Henry Datyner

Others also present, but not identified individually are:

Billy Miller
Peter Halling
Leonard Dight
Raymond Cohen
Joshua Glazier
Louie Rosen
David Belmann
John Ronayne

The bass player by the bottom right corner of the film screen is the principal bassist with the RPO, Edmund (Nick) Chesterman.

Clarinetist Jack Brymer can be seen sitting on his own on the left-hand-side; a SMOKING fixer Sid Margo can be seen next to JB.
Ron Prentice is the bass guitarist in the booth and we think mandolin player Hugo Dalton is next to him.