if you type in the OS reference into Streetmap, you'll see that the you get the 6-figure x/y co-ordinates in the address of the map. take these and put them into this link in place of the "123456"s:
http://www.old-maps.co.uk/oldmaps/index_external.jsp?easting=123456&northing=123456
this will show you the site on the 1866/1867 OS map
using Tom na Chessaig as an example, typing NN770220 into Streetmap gives:
http://www.streetmap.co.uk/streetmap.dll?G2M?X=277050&Y=722050&A=Y&Z=1
so the Old Maps link for this site would be:
http://www.old-maps.co.uk/oldmaps/index_external.jsp?easting=277050&northing=722050
(watch out for the spaces that appear after the "=" - you need to delete them for the link to work)
Cheers
Andy
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