A new £50 bank note featuring James Watt and his business partner Matthew Boulton
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James Watt's new starring role

James Watt was probably one of Scotland's best known scientific figures and even his surname has been used as a unit of energy.

The engineer's face appears on the new Bank of England £50 note which has just come into circulation.

How important was Watt to the industrial revolution and what do people know about him today?

BBC Scotland visited his home town of Greenock to find out.