My understanding is that LOTI HAS been bottled every year for quite some time and it is only now that stocks have reached absolute critical mass. Every subsequent batch has been smaller as a balancing act of using the available stocks for the single cask editions as well as LOTI became an issue.
Eelbrook there is nothing wrong with your info aside from the fact that the last batch was bottled in 2007 making it at least 26, but more likely 27 or 28 years old. Remember it is not a specific vintage...
None of this really matters however. The current situation is that I would bet my mother's wooden leg that there will be very little/none of this left within the next few years.
Doesn't surprise me the price has gone up at the distillery - I always thought it underpriced compared to the likes of Macallan 25. I'm sure you'll find someone still selling it at £150ish.