Start reading the map from the bottom up, to identify the locations
 of where the Snitch families lived

The first recorded occupation of a Snitch family is in Blunham, then Sandy and Potton.
From there they moved to Southill, Eynesbury and Eaton Socon.  Then  on to
Offord Darcy/Cluny, Wistow and Great Ravely before moving back down to Huntingdon.
From here they migrated further north up to Whittlesey/ Peterborough before
dispersing around the country to London and Yorkshire as well as emigrating
out to the USA and Australia.