Hi Kiwibev,
The Valuation of 1848-64 was the Primary Valuation. Three notebooks were used.
1. Field Books: Information on the size & quality of a holding
2. House Books: Occupiers name and measurement of any buildings
3. Tenure Books: Annual rent paid and legal basis - whether by lease, or at will, also the year of any lease.
These notebooks also document any changes in occupation between the initial survey and the final published survey.
The valuation office also holds the 'Cancelled' or 'Revision' Land Books and Current Land Books.
The 'Cancelled Land Books' and 'Current Land Books', give details of all changes in the holdings, from the time of the Primary Valuation up to the present day.
The books can be very useful in pinpointing a possible date of death or emigration, or even in identifying a living relative.
Christopher