Mr Squires believes steroids were first used in ­racing in the 1950s. He makes some startling claims about earlier horse-racing champions. He alleges that 1973 Triple Crown winner Secretariat may have raced on steroids. “There are oldtimers who insist that even the magnificent physical stature of the great ­Secretariat was not all genetic and his early problem settling mares” — that is, breeding — “may have been a by-product of steroids.”

The allegations continue. Mr. Squires writes: ­“Denigrators of the late Frank Whiteley [1915-2008], the surly magician who trained Damascus and Ruffian, ­sincerely believe that his magic came from sniffs of ­cocaine and say they know people who say they saw Whiteley coming out of the stalls brushing the white dust off his hands.”

Fascinating stuff, as I expect Squires’ commentary on the industry power structure to be when I begin reading the book. More to come …