Hi Nick,
I did a few searches and found many references to both the cormorants longest trip and the longest offshore rescue mission in the history of the Cormorant helicopter in Canada etc. etc... but nowhere did I find it saying it was the longest offshore rescue ever.
I don't think it matters what country you're in, we all know that what writers put in their articles are never very accurate to begin with.
The bottom line is that the helicopters today coming off the productions lines of most if not all the manufacturers are superior to the previous generation of helicopters and will continue to go higher, further, faster and carry more.
bb