DH got scammed for about £130 on the internet. He reported it to the police. It took about a year, but the police investigated and then prosecuted. DH was the only victim (or only one daft enough to fall for it). The guy was found guilty. We are honestly so surprised that it was taken seriously.
BTW we are in a Scandinavian country, not the uk. But I am interested if anyone else reported a crime to the police and it lead to a prosecution.