Assuming this is true it is quickly turning into one of the most outrageous scandals in the history of sport. I remember those stories about Mussolini fixing the World Cup or Rothstein the World Series. They seemed so far fetched but now in 2015 the equivalent is being reported in athletics across multiple events. These are the closest parallels I can think of (though admittedly in much more popular sports)
I was one of those who was pretty dismissive of those Russian media reports around Farah but it was a very specific claim to make up and if probablity of being true was X I think it just went up to 10X
Sunday times is behind a paywall but maybe someone can post the original report.