VERTCRS["London Survey Grid height",
    VDATUM["London Survey Grid height datum"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Engineering survey and topographic mapping for transport applications."],
        AREA["United Kingdom (UK) - Greater London and surrounding area."],
        BBOX[51.1,-1.33,52,0.8]],
    ID["EPSG",10989]]