Date: 15 Jul 1986
Susan Tetravot and Brian Price were murdered in their flat. It was thought that it was drugs related.
Michael Horsnell. "Drugs link theory on murders." Times [London, England] 15 July 1986: 3. The Times Digital Archive. Web. 14 Aug. 2012.
Dont know if this is actually unsolved but I couldnt find any conviction so its here.