His bias is tricky to spot - he probably doesn't even realise it exists - the outdated views he holds about women, deep down.
Despite having a clear confession, the Director of Public Prosecutions is said to have declared that the evidence was “clearly insufficient” to support a criminal case.
Floyd, by now based in Belgrade in what was then communist Yugoslavia, was investigated, but, perhaps incredibly, cleared.
His student radicalism was reportedly dismissed as “youthful indiscretion”.
His son Sir Christopher Floyd, 66, now a lord justice of appeal, told he found the allegations about his father “very shocking”, but declined to comment further.
Among Floyd’s scoops was revealing, in the 1960s, that the spy Kim Philby was working as an adviser to the KGB’s British desk after escaping to Moscow.
While at Oxford, Mr Hulbert said, Floyd met Arthur Wynn, who would go on to have a distinguished civil service career but would be unmasked, after his death, as KGB “Agent Scott”, the man who recruited Oxford students as Soviet spies.