I’ll just quote from Stephen Thrower’s blog:
“Murrain” (an archaic term for plague or blight) is a challenging, intelligent, atmospheric made-for-TV drama by Nigel Kneale, about the inexorable spread of irrational fear in a small rural community. It has a few minor problems – some stiff acting in its first fifteen minutes, and the same tendency to shoutiness that also marred Kneale’s The Stone Tape – but these are negligible. Written with an open mind, and a willingness to confront both the dangers of superstition and the arrogance of modernity, it’s a gripping example of the kind of thought-provoking drama that used to turn up, virtually unheralded, on British television in the 1970s. It was commissioned by ATV (Associated Television, a Midlands-based company with studios in Birmingham and Elstree), and played various ITV regions in 1975 as one of a handful of dramas under the umbrella title “Against the Crowd” (other episodes were written by Fay Weldon, Kingsley Amis, and one of the best scriptwriters for The Avengers, Roger Marshall).