I am starting to wonder whether there is something in the notion that some whiskies handle oxidation worse than others. I have tsated the fag end of a bottle of Scapa against the start of a new one, and found no difference, and tasted the ancient remains of a bottle of Maker's Mark - about two inches in the bottle, probably that way for two years - against a new bottle, and found maybe a very little difference, but nothing that would worry me, and nothing I'd have noticed if I hadn't been looking for a difference. But I have just gone back to a bottle of Arran, which was half empty and which I really enjoyed when I opened it and emptied the first half, and it doesn't excite - it seems just a bit flat and almost metallic. This may just be mood/tastebuds on the day, but I have to say I've never found that sort of change in my appreciation of a whisky before. Could be just a duff cork stopper on the bottle, though. Has anyone else had the same disappointing experience?