Here are some very useful online resources that you may not be aware of:
The first is ‘England’s Places’: England’s Places is the digital version of the English Heritage Archive’s Architectural Red Box Collection. This group of over 600,000 images forms one of the cornerstones of our photographic collections. It provides an unparalleled visual record of England’s built heritage, and shows the changing face of cities, towns and villages from the mid 19th to the late 20th centuries.
You might also be interested in looking at the Britain from Above website: http://www.britainfromabove.org.uk/ , which ‘presents the unique Aerofilms collection of aerial photographs from 1919-1953.’
Don’t forget that you can search for old photographs of Lincolnshire on the Lincs to the Past website, in the Illustrations Index collection – www.lincstothepast.com
We also have a collection of aerial photographs of archaeological sites in the Historic Environment Record. You can contact the HER staff at email@example.com to find out more.