The Original London Cast of the musical Cats is featured on the “Cats: Original Cast Recording (1981 Original London Cast)”.

Cats: Original Cast Recording (1981 Original London Cast) by Original London Cast of Cats

—
Genius

This was the first ever cast recording of Cats and consisted of the original 1981 London cast that included Brian Blessed as Old Deuteronomy and Elaine Paige as Grizabella.

They are:

Cats:
Roland Alexander as Alonzo/Rumpus Cat
Geraldine Gardner as Bombalurina
Stephen Tate as Asparagus/Growltiger
David Baxter as Carbucketty
Seeta Indrani as Cassandra
Donald Waugh as Coricopat
Sharon Lee-Hill as Demeter
John Chester as George
Elaine Paige as Grizabella
Susan Jane Tanner as Jellylorum/Griddlebone
Sarah Brightman as Jemima
Myra Sands as Jennyanydots
John Thornton as Mungojerrie/Macavity
Jeff Shankley as Munkustrap
Brian Blessed as Old Deuteronomy/Bustopher Jones
Wayne Sleep as Quaxo/Mr Mistoffelees
Bonnie Langford as Rumpleteazer
Paul Nicholas as Rum Tum Tugger
Kenn Wells as Skimbleshanks
Femi Taylor as Tantomile
Finola Hughes as Victoria

Kittens:
Steven Wayne as Admetus
Peter Barry as Bill Bailey
Anita Pashley as Electra
Julie Edmett as Etcetera