The programme you are thinking of is 'Stay Tuned, We'll Be Right Back', an episode of the U.S. supernatural anthology series 'Darkroom'. First shown on 27th November 1981, it starred Shane Butterworth and Bert Freed. James Coburn was the host. It was on I.T.V. in the mid-1980's, but has turned up on the Sci-Fi Channel. A very underrated show in the 'Twilight Zone' mold.