Realised the limitations of my mathematics and saw the approach / process as a result the bank was seeking in the people they recruited.

Complexity requires team involvement - management by team as well as what this bank was seeking to do - management of the team.

As a manager, would be interested to hear what complementary tests and opportunities to show individual skills the bank had candidates do.

Enjoying the responses - reinforcing recent rekindling my joy of mathematics as I indulge problem solving with my daughter and know it is a challenge worth undertaking for my own wellbeing - thanks Stephen; following you now in the Joy of Mathematics underpinning all (Philosophical statement or question?)