The Guardian just posted this quote from his statement:
"Having seen me grow up from a baby (being born into this ‘contractual relationship’ without any choice) and scrutinised my every move, the tabloids have known the challenges and mental health struggles that I have had to deal with throughout my childhood and adult life and for them to then play on that and use it to their own advantage, I think is, well, criminal."
After reading that I can see why he is giving evidence, the problem I think he has though is that tabloid articles about an individual are not illegal. He still hasn't said anything, as far as I can tell, that constitutes evidence of hacking.
It is all very sad. I hope his evidence doesn't affect others who are also suing.