Thanks Erik - we now have an official answer. _The Macallan_ does not have colouring added. This is what it (or rather Charlie Maclean) says on the site:
The Macallan achieves its deep, amber
colour through natural cask marrying
without the addition of any colouring
But what about other Macallans that are rebottled by The Macallan from other company(ies)' bottlings of spirit obtained from the distillery? Will/Can Macallan state that the original bottler(s) did or did not add caramel?
Not so elementary after all, my dear Watson