I'm not so sure we actually "secured" anything. I rather think it's the opposite.
We'll probably never really know the full truth of this situation - i.e. whose waters were the crews actually in, and if (as seems most likely) it was Iraqi waters, whether their seizure was a deliberate act to see what kind of response was provoked, or whether it was just a cockup by over-enthusiastic Iran Revolutionary Guard, flexing their muscles.
But either way, it's looking like it is largely a coup for Iran. They've "claimed" our people were in their waters, they've paraded them on worldwide TV making those nauseating statements, they've acted the hard man and shown off to the Western-hating sections of the world, they've had the world's media hanging on their every statement and drooling over the suspense, and perhaps most telling of all, they've seen not only a marked lack of unity in the UN but they've seen a very clear lack of any actual action from other EU countries.
Bear in mind, these sailors/marines weren't just British military, they were doing what they were doing
under UN mandate on a UN resolution. And what was the response of the UN? A very mealy-mouthed watered down statement that didn't even amount to a resounding condemnation. If that doesn't show the UN up for the toothless wonder it is, nothing will.
Iran has scored a strategic result in just about every aspect of the farce. And they had exactly one problem ..... what to do with 15 sailors and marines. I personally suspect that they thought they could twist the sort of humbling apology out of Blair that they got last time, and were surprised when their rhetoric didn't provoke that kind of response, but instead got an angry response and an immediate move to escalate (for what it proved to be worth).
That left Iran not being able to hand the hostages back without losing face in the process. So they bleat on about trials, for a while, having already changed their mind about where the kidnaps took place, and then light on a wonderful wheeze, that in a "magnanimous" gesture from "the world of Islam", they'll give the British people an Easter present and concede to return the people they kidnapped. And what's more, they get to do it without actually having to face the idea that an independent international tribunal might investigate because, of course, if it had it may have concluded that the hostages were actually seized from Iraqi waters and that far from this being a magnanimous gesture from a benevolent Islamic revolutionary state, it's actually a bunch of kidnappers returning their illegally seized victims and having the balls to try to pretend that that makes them the good guys. And they get to do it without the apology they would have had to make had that tribunal concluded they'd entered Iraqi waters.
Now, of course, they've a perfect excuse for not cooperating with any such tribunal, and the furore and media attention will die down and move on to the next big story, whatever it is.
Nah, we didn't "manage to secure the release" of anybody,
IMHO. Iran just jumped at the excuse to use Easter as an opportunity to get rid of the embarrassment of actually having still got the sailors/marines in captivity. They'd got what they wanted out of this, and the last thing they wanted was for this to go on any longer. They just wanted a face-saving way of getting out of the mess, without actually having to do the honourable if embarrassing thing of admitting that THEY cocked up by seizing them in the first place.