Home Secretary Theresa May’s website was attacked earlier this year as part of Operation Trial At Home, an effort to raise awareness about ongoing controversies. Police believe that Man is an Anonymous supporter or member of any other online activist group. He was arrested on suspicion of assisting or encouraging crime contrary to the Serious Crime Act 2007. The man has not been named and is due to return in mid-December, pending further enquiries into his involvement in the case. Police say they will take action against those responsible.
Source: https://thehackernews.com/2012/11/anonymous-hacker-arrested-for-attacking.html