Hi, i too recieved this letter dated the 3rd June and am currently searching through loads of websites and forums for advice of what to do this one has some interesting information on it: ACS Law UK Accused of Sending Wrongful ISP Piracy Threat Letters − ISPreview UK as does this one: Everything You Need To Refute a File-Sharing Legal Threat | TorrentFreak and have a good read of this : http://torrentfreak.com/static/The-Speculative-Invoicing-Handbook.pdf