VERTCRS["HS2-VRF height",
    VDATUM["HS2 Vertical Reference Frame"],
    CS[vertical,1],
        AXIS["gravity-related height (H)",up,
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Engineering survey for HS2 project phases 1 and 2a."],
        AREA["United Kingdom (UK) - HS2 phases 1 and 2a railway corridor from London to Birmingham, Lichfield and Crewe."],
        BBOX[51.45,-2.75,53.3,0]],
    ID["EPSG",9303]]