This demonstration viewer is based on 7 October data dump, with 2.4 million confirmed names across Scotland, England and Wales.
It just shows the distribution of names with the element 'Gallow' or 'gallow' to illustrate something of the power and potential of the final GB1900 gazetteer.
You need to zoom in beyond zoom level 14 to view the OS six-inch to the mile layer which shows these names.