Attached is my list of many of the Castles, Forts and Bldg POIs custom modeled by Orbx in TE GB South. This list does not include all of the modeled POIs (e.g. stadiums etc.). I have, however, visually inspected most of the models on the list using P3Dv4. I am pretty sure XP11 has all of these plus a few more.
Rod
TE GB South Alpha Order Castles, Forts, POI Bldgs.pdf