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Is there anywhere else that Assange is safe from arrest?
Diplomatic immunity applies to an embassy's means of transportation as well as its building, meaning Assange could be transported to the airport safely by an official Ecuadoran car. But British police could intervene legally if he steps foot on the pavement to get from the Embassy to the car, or walks from the car through the airport to a plane. There have even been suggestions that Assange could be transported over these short distances using a diplomatic bag, which are also safe from interference by a home nation.

It's like a game of dungeons and dragons. "Oh no, he's got the diplomatic bag!"