Speaking of the Ordnance Survey, here’s a potted history of the OS from the BBC’s Bethan Bell. The definitive history, of course, is Rachel Hewitt’s Map of a Nation (2010), which I reviewed in 2012, but it only covers the first century or so. Bell’s piece is full of factoids—scattershot, random access—from both the 19th and 20th centuries. [A-Z Maps]