The Cambridge University Library Catologue entry for this chant records:

The For SATBrB & organ in E flat minor. Originally numbered '89D': this is a transposed copy of Chant 89C in D minor (see MS.Tranchell.4.88). With text of Psalm 142 pointed by P.A. Tranchell.

Four versions of this double chant are known. Three are found in the Cambridge University Library archive: 

• The earliest version (undated) appears to be the double chant for Psalm 75. ATBB & organ in A major.
• Then we have double chant for Psalm 75. SATBrB & organ in D major and the version for SATBrB & organ in E flat major. These versions might be assumed to date from the period 1982-1989 when the Gonville & Caius College Choir added a soprano line.