An aircraft lavatory complex incorporating lavatories accessible to passengers of reduced mobility (PRM) is disclosed. Left-side and right-side full service lavatory units are accessible via left-side and right-side lavatory access doors opening in opposing directions. The left-side and right-side full service lavatory units are separated by a common central partition repositionable by cabin crewmembers (but protected from independent repositioning by occupants of either lavatory unit) to enlarge either of the left-side or right-side lavatory units for enhanced PRM accessibility.