Ghostly white apparition spotted in uk home

Dduring a routine photo shoot this camera picks up awhite figure moving in an upstairs window.Residents on the ground floorfor the interview maintain that the house was emty.The film crew thought it was simply a reflection at first,but then noticed the reflection of the flag in the for ground,so what is the white figure.A prank a trick of the light,or a spectral former resident of the apartment complex.