So I offered to attempt to use the magic of the internet to help, and there was a race. Twitter and its randomness versus email, which kind of seems a little bit old fashioned now!
After half a dozen re-tweets Twitter, in the shape of Bob French, came back with an answer:
@gareths121 Think it's a shochu not a whisky: goo.gl/03DLK 5th bottle from the bottom - called 'sea of clouds'...
— Bob French (@BobNotBob) March 22, 2013
Further information came from Adam Matheson in the form of a blog post on the Shōchū in question.
Maybe it's a case of 'it's not what you know, but who you can tweet'? Many thanks to all the people that re-tweeted and to those that took the time to have a look and solve the mystery. In terms of old vs. new, Twitter was quicker but Tatsuya, the Suntory whisky ambassador, also came up with the same answer - one shot, one goal - it might be old fashioned but it still works.
* If there had been some left in the bottle this whole thing might well not have happened, given it looks like a clear liquid!