The National Library of Scotland has placed parts of it’s rather a nice collection of old maps online. It’s all very modern – slippy, google maps style pages abound – and predominantly released under permissive licences. It is not, however, easy to get a full map for reuse in a school report or similar.
So I’ve run up a little code, grabbed some of the maps and put them on a new sub-site here. These maps are licensed by the NLS (as opposed to being in the public domain) and this license has carried down to my derivative work. As of writing, there are only seven of them, but I have several hundred more ready to go up shortly and a block of several thousand more to go up at some point after that.