You had me worried there, Jon, because given that the Stephens surname is in our family tree I thought I had misspelled "Robert Stevenson's" surname and I should have known better, however having done a quick Google the Scottish civil engineer was Robert Stevenson born 1772 - responsible for the Bell Lighthouse - and the English civil engineer was Robert Stephenson born 1803 - responsible for the steam engines.

Phew! What a relief! I won't be haunted by my relatives.