called the Internet Watch Foundation (IWF) that works in conjunction with the UK police.
You'll appreciate that not all offensive mail is illegal, and the police can only act if the mail contains something that is illegal, or refers to something on the internet that is illegal. The British police can only act if the mail originated in the UK, or if the server that carries any illegal content is located in the UK. The IWF will assess the mail that you've received, and will take whatever action they decide is appropriate - which may involve making a report to the police, or to the ISP involved, or both.
I should stress that you should not report the matter to the Police directly - they prefer these matters to be referred to the IWF who are qialified to make judgments about the content.
Please be aware that the IWF (and the police) can only act in cases of:-
1. Child Pornography located anywhere in the world.
2. Adult material that would breach the Obscene Publications Act, but only if the offending site or service is hosted or registered in the UK.
3.Criminally racist material - but only if it is physically hosted in the UK
You can contact the IWF if you
Good luck cara - I'm sorry you've been on the receiving end of something so unpleasant.