Vocal: Lynne Richards. Walter Kent also wrote I'll Be Home For Christmas (see there). No bluebird ever flew over Dover. It's a North American bird, not even mentioned in The Oxford Dictionary Of British Birds, let alone in The Expurgated Version.
Tommy Tucker [for OKeh]
Kate Smith [introduced the song in her radio show]
Kay Kyser [n°1 US]
Vera Lynn [with Mantovani's orchestra for Decca]
Mystics [vocal: Jay Trayner pre Jay & The Americans]
Blue Beats [ska version as Blue Beats Over]
Frida Boccara [as Les Falaises blanches de Douvres]
Robson & Jerome [n°1 UK; accordng to the Righteous Brothers arrangement]
Not to be confused with The White Cliffs Of Dover by The Casini Club Orch. (with Vera Lynn!) in '36, written by Leon/Towers.