It's different depending on your Branch of Service - Kev's RAF, so wouldn't be expected to have to endure days of torture (days of Death By PowerPoint, maybe).
The Booties (Royal Marines) would have had a more dedicated brief, but even that would just be part of the basic OPTAG packages run by the Army at Shorncliffe/Lydd and by the RN at Portsmouth. If you're going to do 'extra-curricular' work then you can do the 'Resistance to Interrogation' course, all of which is restricted, so I'll gloss over the details. Suffice to say, you get beaten up a bit, so you know where your own personal limits are.
AFAIK, all I'm required to give up, info-wise is Name, Rank, Service Number and D.O.B.
Anything else is outside of my purview - i.e. why we're there, what our mission is, what do I think of Tony Blair etc.
I'm required to give as little information up as possible for at least 24 hours, after which any sensitive information I may be in possession of will have been negated.
After 48 hours, I can make up anything I like.
I always tell people I'm a Dolphin Trainer.
Seriously, no-one expects a Leading-Hand in the RN to know anything of value to the enemy. You will note that the officer in command of the group, a Captain, RN wasn't on camera until the very end of this episode. Some of the lads on camera were plainly taking the p*** out of their captors, lounging around and eating bananas.
Writing letters denouncing the Government? No - that's a Flogging Offence, Hookie and she should be ashamed of herself. But what else can you expect from the Senior Service? Tough for her, being a young Mum and all, but that's why women shouln't be in the Front Line. Sorry, anachronistic, mysoginistic, call it what you will - they don't belong. War is a Man's thing - it's brutish, nasty and bloody and I for one don't want women exposed to all if that.
I like girls and I don't like seeing them torn to pieces by shrapnel, thanks very much.
In conclusion, I still can't figure out why they didn't put up a bit of a scrap - RIBs are pretty fast and unless the boat was diffy, they shouldn't have been manouvered into a position whereby they were surrounded by Iranian gunboats - bad drills, if nothing else. The decision to capitulate would have been taken by the officer in command and he'll be getting de-briefed on all of that right now.
Remember, Royal's rule of thumb is: if in doubt, Brass it Up! (Brass-Up - to shoot - from the brass cartridge cases left over) So I don't imagine it was a case of Yellow Spine-Fever on their part.
We may never know the full story and speculation, even within the Military community will be rife.