CNN just had a report. Said that six Iranian boats/ships were involved. Not regular Iranian Navy, but Revolutionary Guard. The British servicemen, Royal Marines (if I got that right) have been taken to Iran. No US personnel involved.
That means that this was a planned incident, not a stray patrol accidentally rolled up by Iranian naval forces. The IRGC wants leverage, and they knew where to get it. That also means that they have a plan of some kind, and very specific goals. Some kind of prisoner exchange is on the horizon.
Sadly, but all rhetoric to the contrary, we are generally quite willing to negotiate with terrorists, so long as they fly the Iranian flag. We encourage Iran to act this way by openly tolerating their flagrant outrages.
Imagine if they took the Prince? I can never remember his name. Iranian military installations would turn into the largest fireworks show the world will ever see if they kidnap him. Certainly bombed by the UK, Australia, Poland, as well as us. We'll certainly jump into the fray. We haven't even gotten back at them for the Embassy hostage crisis yet.