Faith in this Colour lyric

Hi Katy! I had a question for the fellows:  I have been listening to “Faith In This Colour (alternate slow mix)” from the singles boxed set and near the end of the song you can hear voices. My question is: is this Simon ad-libbing or is it a prerecorded track (like an excerpt from a song) thrown in? I have listened very closely and still can't figure what the person is singing/saying. Forever listening, Kaisa

”Oh this has to be ad-libbing, sampling was unheard of when we did this song. I haven't got a clue what the lyric [if there is one] is. Simon"