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In my experience the EA don't want to know. They're basically only interested in checking licences (tax) and monitoring for minor bylaw infringements. The EA recommend that anglers report incidents such as this to the police. For monitoring and building up intelligence. There is a specific operation name and code number for reporting incidents to the police. These I don't have but are most likely available online or via the Angling Trust web site.
Sorry I can't be more positive, but I've been there myself, and unless it's salmon related, you're unlikely to get any action. This has been going on since the late 90's.
Certain areas have their own voluntary bailiff scheme...such as the Fens.