Why, they call the police, of course.
Here's a question: If Mohamed Haneef tried four times to call the British police with pertinent information about a failed terrorist attack, and failed, what does that say about the efficiency of the British police's comms systems and the amount of information that fails to get even as far as someone picking up the phone?
Here's another question: From the linked article, the treatment of Haneef seems to have been a matter of Kevin Andrews applying his intelligence and reasoning powers to the range of material before him. Now then: what did we already know about Kevin Andrews' intelligence and reasoning powers?
And while I'm here, a third question: what sort of relationship does Kevin Andrews have with his brothers (I'm presuming for what I hope are obvious reasons that he has some)? Is he incapable of imagining how a brother might behave and what a brother might say when he saw his sibling in potential trouble of this magnitude?
And if Haneef is indeed entirely innocent in this situation, what do his and his brother's fear, and the urgency of the perceived need to get out of the country, say about the way the Australian government is now viewed?