6/8. William Mudge 's Ordnance Survey 1st Edition (1809). The end of the 18th century was a bad time for Britain - the American colonies had just been lost and the French fleet was on standby to attack Britain. This threat of invasion resulted in the army employing 29-year-old Lieutenant William Mudge to map the country in an attempt to see where the French were likely to target. Nicholas Crane tries to reproduce the triangulation methods of Mudge's original survey, but will he come a cropper across the dangerous wilderness of Dartmoor? Director Richard Maude
Series producer Michael Waterhouse