The Hexham heads - Any developments?

The phenomenon of the Hexham heads, has always intriqued me. Mainly because the case involves a number of Paranormal effects, and the people involved seemed like honest types, who had nothing to gain from the publicity they received, and who came across as being genuinely terrified by the events that they became involved in.

You can find a brief summary of the events here:

The Werewolves of Britain by Nick Redfern
(don't be misled by the title, this event contains several paranormal effects)

So my questions to ATS community are:
The heads were lost, have they ever been found? Are there any theories regarding their location?