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Audio slideshow: Brunel's achievements revisited

"It is 150 years since the death of Robert Howlett - the young photographer who took this iconic image of engineer Isambard Kingdom Brunel.

"Robert Howlett died - in December 1858 - from a fever, most likely caused by exposure to the poisonous photographic chemicals that he used.

"Intrigued by how the Brunel photograph was created, photojournalist David White set out - using non toxic methods - to recreate some of Howlett's images.

"With a specially-made camera, he travelled across south and west England to view Brunel's extensive legacy".

Story and slideshow here