This thread contains links to a custom map of all POIs in the sim, and is updated for the UK Scenery. If it’s listed, you’ll find it there.
Otherwise, you’ll need to use a Map Service like Google or Bing to find it, then obtain the Lat-Long coordinates. You can plug those into the sim Flight Planner to make it a point on your flight plan. If it wasn’t listed in the map above, it may likely appear as a generic building as all the POIs in scenery are handcrafted.