What don't you believe?
What else do you think the Royal Marines were there for if not to get a job done?
You're not making much sense here - that some ships have been seized by both the UK and Iran isn't in dispute, yes both sides made use of a helicopter and small boats in achieving this.
My comment was to BowdonUK who seemed to be unaware that the account of the takeover of the Grace 1 was pretty much the same. And also, I stated that I don't necessarily believe it (or disbelieve it) as no video has been released. In other words I'm not claiming it was exactly the same, just to look at what the accounts say.
Fail to see how it doesn't make sense.