text: A few suggestions:
  
  NLS Maps should have old OS maps. The more detailed ones cannot be displayed on websites w/o a licence now.
  
  If you have a scanned copy you can rectify this map at mapwarper.net which can then be used as a background (for instance in JOSM or elsewhere).
  
  Umap could be used to display the data if photos are hosted on a website with individual urls.