The UK's Universities Superannuation Scheme has this week made its third investment in infrastructure in two months; a controlling stake in Sydney's main airport railway. FN caught up with Mike Powell, head of private markets at the UK's biggest pension fund.

Financial News: Does USS have a particular interest in airport and air-travel related investments? After all, your last three investments have been in Sydney's Airport Link, the UK's National Air Traffic Control System and in Heathrow Airport.