The parish contains the hamlet of Woolsthorpe-by-Colsterworth . In 2001 there were 1,508 people living in Colsterworth . Colsterworth , together with the hamlet of Woolsthorpe-by-Colsterworth , had a population of 1,508 according to the 2001 census , and lies half a mile to the west of the A1 road , seven miles south of Grantham and 13 miles north of Stamford .