Iran's smart. They know that the UK won't do anything physical to rescue them or retaliate. Blair is so politically weak, he can't do a thing.
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Britain is the "new France" and they will not be Britain again for a long time. They might as well go home and disband their military after this incident.
Unfortunately, Blair & Bush are politically weak. Anyone who imagines that either would react forcefully and violently about this kind of situation is living in fantasyland.