Dunno what to make of this, but i have a feeling Willie McKay is at the centre of this enquiry. Newcastle said they aren't being investigated, but an individual is. So i dunno whether that means a Newcastle staff member or an agent, and the police are looking for documentation.
I think its Souness at the centre of it all, probably the Boumsong transfer, wouldn't be suprised if Blackburn got implicated as well.
Although its a Celtic site this may shed a bit of light on what it maybee about. http://www.celticquicknews.co.uk/2007/07/boumsong-arteta-gaol-for-rangers.shtml