Added here with pleasure at the suggestion of Edward Johnson, John Steane in this BBC radio programme from 1989 discusses the work, Serenade to Music, VW wrote for Sir Henry Wood featuring sixteen singers, as recorded.

Sir Adrian Boult’s 1969 HMV recording, with sixteen singers (pragmatically, VW made alternative versions: four singers, chorus & orchestra; chorus & orchestra; orchestra without vocals):

Sleeve for ASD 2538 (singers listed on front):

https://www.discogs.com/release/8860449-Vaughan-Williams-Sir-Adrian-Boult-London-Philharmonic-Orchestra-Symphony-No-5-Serenade-To-Music/image/SW1hZ2U6MjQxNjYwNTk=