A fifth person has been arrested over the discovery of human remains in the garden of a house in south-east London.The 35-year-old man was detained on suspicion of murder after the remains were found by police on Sunday.Three women and a man were previously arrested in connection with the inquiry in Lynsted Gardens, Eltham. One woman has since been bailed.A post-mortem examination of the body is due to be held later, the Metropolitan Police said.Excavation work at the address is likely to last a number of days, the force says, and officers have been carrying out inquiries in the area.Two women, one aged in her 60s and the other in her 40s, and a man in his 40s remain in custody at a south London police station.They were arrested on suspicion of murder and conspiracy to pervert the course of justice.A third woman, aged in her 40s, has been released on police bail.