"He had drugs influenced on him. Just cannabis. It give him mental problem. Bit paranoia. He was diagnosed by a doctors and treated in 2007 for paranoia.
Links
[1] http://www.channel4.com/news/leytonstone-attack-accused-had-mental-health-problems
[2] http://rethinkpot.org/tags/london
[3] http://rethinkpot.org/tags/mental-health