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Investigators discovered Saadi had an interest in true crime and was studying criminology and criminal psychology at the University of Greenwich.

The criminology student at the University of Greenwich had collected knives and researched locations to carry out the killing, the court was told.

"This is an excellent chance to go out, look – safely – and to be able to see the movement of the solar system for yourself," said said Anna Gammon-Ross, Senior Planetarium Astronomer at Royal Museums Greenwich.

It was also discovered that Saadi, a criminology student at the University of Greenwich, had an interest in true crime and had bought multiple knives online.

Ofwat and the industry have previously denied the figure– which comes from University of Greenwich research – is as high, but there is agreement that significant investment is required.