Written by Arthur Swinson
A dramatised documentary series on the work of the Emergency Call Service
with John Barrie and Jerold Wells

It may be a sudden illness, a child screaming in the dark, or an accident - a dozen doctors are waiting in their cars to be alerted by radio.
They are members of an organisation to which over three-quarters of the General Practitioners in London subscribe. It contracts to cover doctors' calls when they are away or otherwise unavailable.