If by guilty, do I think that hacking into someone’s voicemail is illegal, I would have to say yes. Just as illegal as finding a key to someone’s house on the ground and using it to enter their home while they are gone.
If by guilty, do I think he knew about the hacking, I would have to again say yes. Paying 800,000 pounds to Gordon Taylor and 1,000,000 pounds to Max Clifford would have to have been approved from the very top.