These links may be of interest for local research.
A Vision of Britain Through Time search for the area, then click on the map and use the dropdown menu to see which historical maps are available. Click 'Historical statistics' and 'Census reports' for a wealth of vintage demographic statistics.
Bedfordshire Archives and Record Service
Bowes catalogue of books printed or related to Cambridge University, the City and county, 1521-1893 (NB. The catalogue does not make any reference to Little Gransden).
British Geological Society geology viewer.
British History Online - much of interest here.
Cambridge University Library - includes much local material.
Cambridgeshire County Council Library
Cambridgeshire Family History Society
Cambridgeshire Records Society
Caxton Union workhouse (where many people from Little Gransden resided).
Discovery - The National Archives
Gatehouse - Little Gransden Manor of the Bishop of Ely
Historical Directories - county directories of tradesmen.
Internet Archive - a library of interesting documents all OCR rendered.
Janus Archives and Manuscripts
JSTOR is an archive of important historical journals ideally accessed through a library subscription.
Land Registry house sale prices
Little Gransden Parish Council
Ordnance Survey Boundary Line tool for councils and further information. Tick boxes to add layers.
Property values heatmap by Zoopla or this by Plumplot
Researching Historic Buildings
Royal Mail - see how far people are moving in and out of the area
South Cambridgeshire District Council Planning
The Genealogist for tithe records 1837-50s.
The Times Digital Archive available through the Cambridgeshire Libraries website.