The National library of Scotland, which has long provided a much better coverage of free OS maps of Scotland than is available for England, has added the sixth Inch maps of england & Wales to its website(https://maps.nls.uk/os/6inch-england-and-wales/index.html). These (which correspond to 1:10,560) are not quite as detailed as the 1:2500 maps which are available from the Old maps site or Alan Godfrey (buildings are rectangles, and do not follow the actual outlines), but this range does, for some areas , seem to provide a wider range of dates than the old Maps site,