I found this entry in the Library of Congress’s Catalog of Copyright Entries on archive.org:

EILEEN JAMESON'S EXPERIENCE; w & m Alasdair Clayre. (In A cold wind blows & other songs. London, Clarion Photographic Services. p.9) © Nina Music; 1Sep66; EF31518.

And the booklet of the Three City Four's album noted on the song:

Alasdair Clayre, poet and songwriter, says this song, of the blasé
teenager who's seen it all and experienced it all, is based on a
conversation overheard on the top of a London bus.