Bribery is a crime - If that is what has happened. Admittedly it is very hard to draw full conclusions without all the information.
The benefit of a police investigation is that peoples names arent dragged through the mud to try and make a quick buck. If not all the people named have done much wrong (Jimmy F-H as an example may not have done anything) then the press still tear into them. But the police can investigate and if someone is clean, their public image isnt completely tarnished.
The Telegraph won't really want sued for defamation and loss of earnings, so anything they report/show is very likely to be fact. That said if it isn't they can and will be sued by the affected parties. The defence against defamation is 'truth'. http://www.howtolaw.co/defend-a-defamation-action-392175

