Not all readers of this column will be familiar with Scotland’s other national drink, being Barr’s Irn Bru. However, some of the factors influencing the recent trading update from AG Barr will resonate with SA soft-drinks manufacturers and their customers.

This iconic Scottish brand, which has many copycats, is orange in colour, perhaps a reflection of the apparent iron content in its secret recipe. And woe betide anyone who spills it on the carpet; it is almost impossible to remove the resulting stain. ..

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