Remember Davenport Lyons? Their clients who discovered that it was actually ruinous to get a reputation with paying customers as RIAA-like thugs certainly do. They’ve been all but silent of late.
However, a new UK law firm, ACS Law, appears to be doing the same things: sending out legal threat letters demanding between £400 and £700, but disappearing with no further response when questioned more closely. TorrentFreak details the unearthly similarities and gives a nice list of questions you can send if they ever contact you.