I don't know if anyone has previously suggested this site.
It's from the National Library of Scotland. You can pick an old OS map from the drop down menu, I find the 6 inch 1888-1913 the best, and by sliding the blue button in the bottom left it then superimposes the current birds eye Bing photo over the map. Fantastic for pinpointing old tracks, building etc.
Cheers Dave Anthony
Many thanks Dave, well worth noting and trying.
But that's life. cheers JOHN C Many thanks John