For the sake of a little extra effort...

...a lot of innocent people could have been weeded from this list *before* the dawn raids started.

A particularly galling bit from tonight's programme: here's the record for your credit card transaction; that was made from a computer in (tappity tap) Brazil. On a Friday morning when the accused was at work in the UK.

No local plod is going to know what an IP address even is, let alone how to find out which country it's in. Stuff like that should really have been checked when the list was being compiled in the first place, not left to individual investigations, and certainly not raised as an afterthought after people have been erroneously run through the mill.