I have just sourced a bottle of the Redbreast 15 for my next tasting (nex tweek) and as far as I know, the shop where I bought it has a good stock. I may get some more if it's successful.
As fo shipping abroad:
I really have no problem shipping abroad.
Within the EU no customs declaration is required, therefore there is nothing on the outside of the box to state what is inside. I doubt very much whether any individual boxes will be opened when delivered between EU countries, customs just don't come into the equation on this scale. Delivery companies do everything themselves without any intervention when within the EU.
I believe the real 'problem' is with bulk shipping, as happend in this test case. A complete van load of alcohol was shipped, not just one parcel.
As for shipping outside of the EU: Exactly as normal, fill in the customs declaration and send.
If any local taxes are to be paid, then yes, that is the responsibility of the buyer upon receipt of delivery.
It is also interesting to note how some companies (Errrrmm Macallan. Sorry, Edrington - not just the Macallan distillery) suddenly stated that it was "illegal" to ship outside the UK when the distance-selling laws were brought in by the EU. According to Edrington, the fact that people have the right to return goods if not satisfied, makes it illegal to ship outside the UK.
(But don't worry, when the UK gets ID cards, the UK Gov't will probably make it illegal to buy anything outside of your own village