Makers of Scotch whisky are worried about trends showing falling sales volumes of Britain's biggest food and drink export, although sales were still higher in terms of value in pounds, they said Monday.

Sales of Scotch overseas fell 2 percent to 528 million bottles in the first half of 2017, although the value rose 3.4 percent to 1.8 billion pounds ($2.37 billion), helped by a shift in tastes to more expensive single malts as well as a weak pound, the Scotch Whisky Association industry lobby said.

In the same period, sales in the U.K. fell 2.6 percent in the first six months of the year to 36.7 million bottles, figures released earlier this year showed, following a hike in taxes.

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