Credits where I know them, or remember the name:

The prelude is played by Keith D. Shawgo, Jr., Assistant Organist.
The piece is Carol, by Percy Whitlock.

The soprano soloist is Joemy Wilson, the alto soloist is Umeko Shindo, the bass soloist is Arthur Thompson,
I do not remember the name of the tenor soloist.

I Saw Three Ships and What Cheer are by William Walton (I think!);
Lulla LullaBye is by William Byrd;
Verbum Caro Factum Est is by Hans Leo Hassler;
Calypso Carol is by Leo M. Tellep;
The Five Lesser Joys of Mary ("When Mary Lay Fretting") is by Peter Warlock;
Personent Hodie is an arrangement by Seth Bingham.
The postlude, In dulci jubilo, is by Sigfrid Karg-Elert.

Searle Wright and St. Paul's Chapel Choir, Christmas 1966