Ice by James Follett

Eight thousand square miles of solid ice have become detached from the Antarctic and are drifting inexorably towards New York Harbour. The combined might of the US military seems powerless to avert the collision, but if it occurs, the whole city will 'ring like a bell'.
Narrator Sean Barrett
Julia Hammond: Carol Drinkwater
Glyn Sherwood: Anthony Hyde
Oaf: Eric Allan
Captain Hagan: Ed Bishop
Admiral Pearson: Don Fellows
US President: Alan Tilvern
Angus Brill: Brian Hewlett
Walter Krantz: Peter Marinker
TV reporter: Kim Wall
Maguire: Bruce Boa
Stevens: Jonathan Tafler
Steward: Peter Howell
Mason: Andrew Branch
Lt Klein: David Goodland
Greaser: Stephen Hattersley
Chief Engineer: Paul Gregory
TV announcer: Rachel Gurney