The British national population grown in size several fold since the year 1800 and since 1700. The British national population shows net increase for more than 300 years, indicating that, over all, death rate less than birth rate. It handy to, sort of estimate authors usefully referred to the 'natural population growth'. Studying an individual place, the relevant local estimate is a useful pointer to the local significance of immigration. Birth and death rates combine variously to yield an assortment of net rates of population increase or decline. Local growth immigration distinguished from the phenomenon of overall national population increase, the two things not completely separable. Data collection consist a line by line scan of the enumerators' books for the town, amassing cumulated counts of the numbers of individuals. The product of four forces, birth, death, immigration and emigration, and each of the complex, estimation of population cannot done from sources baptismal or birth registers.