FatB*****D Pmed me with some tips on finding the original song Ray of Light was based on and BINGO:

The song is not Seraphim but 'Sepheryn' and it can be found on the following CD:

Sepheryn: The Definitive Collection CD
Curtiss & Maldoon
Sepheryn: The Definitive Collection CD Buy it here

I think I will buy it myself since the snippet I heard of the original was lovely.