The West cannot allow Iran to take hostages.
Britain should apologize to Iran.
The hostages will be freed.
Then we take out their nuclear plants and military command and control.
If they respond by invading Iraq, then we respond by bombing everything resembling an Iranian military base.
That ought to provoke a revolution in Iran.
If it doesn't, well, we bomb everything resembling an Iranian tank and if innocent people get in the way, that's what happens in wars, and if Iran doesn't like it, maybe they shouldn't have started it.
This might also be a good object lesson for certain other countries I can think of.