Ms Vennells, who had not spoken publicly about Horizon for almost a decade, was quizzed over three days in May in the most anticipated appearance of the inquiry.

One of the tougher problems asks puzzlers to calculate how far off from writing the numbers one to 20 the quiz setters were.

As MPs prepare to quiz the boss of the financial regulator over its role, there seems to be an industry consensus that only the highest court in the land should settle this affair.

At my signal, unleash hell and take the following quiz to find out.

But it is also avoids complicated computer algorithms and relies instead on more traditional personality quizzes shared with members online at the start of every month.