Adam Hart-Davis takes a ferry across the Mersey to celebrate the work of the North West's unsung heroes of science.

He relives his childhood love of Meccano, invented by Frank Hornby, before uncovering the work of other innovators, including Arthur Doodson, who perfected a way to predict tides; Alastair Pilkington, who invented a way of producing flawless glass; and Jeremiah Horrocks, who was the first to track the orbit of Venus and revolutionised how we consider the universe.

(Postponed from Good Friday)
(Repeat)