"Omnibus" Whistle and I'll Come to You 1968

Synopsis:

A university professor, confident that everything which occurs in life has a rational explanation, finds his beliefs severely challenged when, during a vacation to a remote coastal village in Norfolk, he blows through an ancient whistle discovered on a beach, awakening horrors beyond human understanding.

Directed by: Jonathan Miller
Written by: Jonathan Miller
Runtime: 42 minutes
Related titles:
Cast:
Michael Hordern
Michael Hordern
Professor Parkins 
Ambrose Coghill
Ambrose Coghill
Colonel 
George Woodbridge
George Woodbridge
Hotel Proprietor 
Nora Gordon
Nora Gordon
Proprietress 
Freda Dowie
Freda Dowie
Maid