There are three things you need to know about Troy Armour. They relate to the person and not the business, for, while Armour runs a fascinating selection of eclectic companies, the man himself is far more intriguing. The first is that he spent his early years in a caravan in Donegal in the late-seventies, while his father, a man with an existential fear of debt, worked and scrimped and saved enough money to build his own house without turning to the bank.  “Stay in the middle of the road,” his father told him repeatedly. “If you are in the middle…