I found the following by chance and so presenting it here to share ( not sure if its been covered before ) , its a database that overlays older/old maps of varying sorts with Google Map.
http://maps.nls.uk/geo/explore/#zoom=9&lat=50.9942&lon=-4.0973&layers=1
Enjoy.
http://maps.nls.uk/geo/explore/#zoom=9&lat=50.9942&lon=-4.0973&layers=1
Enjoy.
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