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I heard about this. The rotten bastards. Assuming that they find and convict those responsible (and it sounds like they are busy doing that), it would be nice to take them up in a helicopter to about 3,000 feet, handcuff the pair together, and toss them out. The fall would be highly educational. Since Great Britain doesn't have the death penalty, it could be described as an "accident" by the government.
They are already under arrest in a hospit. They waited for the police to arrive and then ran towards them with their knives before being shot.