I'm currently researching a novel that has a crime element that centres around Internet-exclusive relationships and I would appreciate any help you might be able to offer regarding how much access the UK police have to ISP logs (and any other relevant Internet-based information) and what this information might tell them.
A little more info on the basic scenario: computer equipment has been thoroughly destroyed (on a bonfire — the platters melted, etc.) and the owner has been murdered. The criminal investigators have reason to believe that there is an Internet relationship to be investigated but, because of the destroyed equipment, do not have the access to the information that they normally might. So, what could they do about investigating through ISP logs, bearing in mind that the individual concerned is now dead?
Also, am I right in thinking that, under current legislation, police have no access to Facebook accounts/logs and Skype?