Thanks again, chgoeditor. You're right of course, but also I wasn't entirely sure whether there was some rule in place about 72 hours - but almost the other way round - i.e. if entering the country, you had to be in place for 72 hours otherwise could not claim any duty free allowance.

In terms of the rarity - yes, it's rather precious stuff. The cost of purchase wasn't huge, but they were limited release single malts from the Islay Whisky festival. You can only get them on the day of release, and only if you are there (or else shell out $$$ on ebay). They are lovely things which I look forwards to enjoying with friends in Canada.

Here's hoping for a friendly customs officer in a good mood :-)

Thanks again for your response.