For those who wonder, this is the running programme I am involved in at the moment. I first discovered in 20 years ago and later used it (twice) to train from couch to half-marathon, one under 2 hours, the other 47 seconds over (which hurt).
It was designed in about 1980 when a Times sports/fitness writer whose name, I regret, I no longer have, was asked to design a couch-to-Marathon Programme.