The missing aristocrat, her partner, and their newborn baby have been missing since their car broke down near a motorway in early January
Officers have appealed for people to remain"vigilant" in areas of open land or check any outbuildings they may have on their property.Detective Superintendent Lewis Basford told Sky News:"We are currently looking into all available areas that the baby could be in the open land.
"The search will include every facility in this location, going out into the open land to try and locate the baby."
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