What do private investigators have access to?
A private investigator has exactly the same access to places or information as you do as a private UK citizen. No more, no less. The only difference is they may be better at the going and the doing and accessing. A good example would be Open Source information gathering is what it says - open-source and available to all but often this information, whilst freely available, is hidden among a vast sea of other not so relevant information - when was the last time you looked at page 100 of Google let alone past page 1?