Nelson Wannell married Topsham, [Devon] 1848
I found the following information whilst cataloguing a book (The young man's companion : or Youth's instructor; being a guide to the various branches of useful knowledge, 1826) and thought I would post it in case anyone was researching this family:
Manuscript annotation on front pastedown: Nelson James Wannell and Mary [illegible] Williams was married at Topsham church September the 5th 1848.
Manuscript annotation on back flyleaf: Nelson James and Mary [illegible] Wannell was married at Topsham church Sept 5th 1848. Ellen Jane Wannell daughter of the above was born September 21 1849.
This book is held at the University of Leicester, UK.Hope this helps.