1. The premises of the mission shall be inviolable. The agents of the receiving State may not enter them, except with the consent of the head of the mission.
2. The receiving State is under a special duty to take all appropriate steps to protect the premises of the mission against any intrusion or damage and to prevent any disturbance of the peace of the mission or impairment of its dignity.
3. The premises of the mission, their furnishings and other property thereon and the means of transport of the mission shall be immune from search, requisition, attachment or execution.
Otherwise could they hide him in some kind of cargo? I heard that they can't pull over and search a diplomats car but the transition from car to plane is when they could get him.
The police have the power to stop the car, but not search it. Do diplomatic vehicles have toilets?
Edit: Helicopters specifically; but with the ground-to-air missile sites installed around the Greater London area (ostensibly for protecting the Sporting-Event-That-Shall-Not-Be-Named; a WTF in and of itself), I'd be very careful in mucking around the British airspace: http://everything2.com/title/crashing+a+helicopter+in+Centra...
Sweden has recent form for taking legal shortcuts in this area.
Sweden also has a history of dropping prisoners off at the airport where they get met by people who are DEFINITELY NOT CIA agents and disappeared.
From all evidence it is clear that he will be extradited to the US where he just might face the death penalty.
Because there is none, it is a matter of legal record that it is MUCH easier for the US to extradite somebody from the UK than from Sweden.
But that simple fact (which Assange himself acknowledged in the past!) is rather inconvenient when you are trying to build some conspiracy theory.
[1] http://www.guardian.co.uk/commentisfree/cifamerica/2011/apr/...
Further, no such charges have been brought in the US, and more importantly, even several prosecutors have claimed such a charge will be difficult to produce, given the protections we provide the press here.
Finally, this whole "fear of death," is completely manufactured. He will get a much fairer shake than all of the Chinese dissidents whose names he released unredacted.
Also the US has, in recent years, demonstrated that its protections are primarily intended for their own citizens. Apparently it's OK to strip foreigners of any such rights, if they are perceived as enemies and this is deemed convenient.
What evidence? So far all I've seen produced is speculation based on quotes from political figures that lack the power to make this happen.