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Scotland's independence referendum on 18 September may depend above all on how it is expected to affect the economy. So Justin Rowlatt travels to Aberdeen to test the waters among the business community.

With much of Scotland's economy still tied to North Sea oil and gas, we hear from Mark Abbey of CHC Helicopters and Louise Nicolson of Bread PR - two people whose businesses depend on oil sector clients, as well as oil rig workers.

Justin also speaks to Aberdeen University geology professor and Yes campaigner John Howell, as well as oil reserves sceptic Sir Ian Wood of engineering company Wood Group.

Billionnaire Sir Tom Hunter explains why he launched an audit of the economic impact of independence and his concerns about a Yes vote.

Martin Gilbert, head of Aberdeen Asset Management, describes the likely impact on the financial services sector. And Kenny Anderson, head of Anderson Construction, tells Justin why he has nailed his colours to the independence mast.