If this is referring to what I posted earlier, then you have chosen a different map to what I linked.
Here is the London grid map displayed using what you did: https://geo.nls.uk/mapdata3/os/ldn_tile/#ldn_nat_grid/ol3 On the right, it shows background imagery. "OpenLayers3" in a map of OSM, although you can display this NLS imagery over google maps, or leaflet, or "google maps API". Don't know what the "holes map" which you linked was however. It doesn't show house numbers but seems to have more coverage.
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