The LP you want is:

'The Music of Erik Satie: Through a Looking Glass'
Camarata Contemporary Chamber Orchestra
Gymnopédies 1, Deux Préludes Posthumes (arr. Poulenc), Gnossiennes, Le fils des étoiles, Sarabandes, Camarata: Through a Looking Glass, Parade - Ballet Réaliste.
1971, London 414 083-1 / Deram #DES 18052

Sadly, it has not been issued on CD.

kind regards

Andrew