Recently Tommy Robinson's daughter was allegedly sexually assaulted by a man at a holiday resort somewhere in the United Kingdom.
Tommy has claimed that he legally prevented the accused from leaving after confronting the man. He allegedly punched the accused in the face several times. He called the police.
Upon arrival, the police interview Tommy's 8 year old daughter who told them what had happened. She stated that the accused "squeezed" her "bum".
My question is, what is a valid reason to not arrest the accused? Secondly, what are the minimum requirements for a man to get arrested for sexual assault in the context of this story, i.e where the "crime-scene" is still "fresh" and all parties involved are present?