Irn-Bru sales have risen despite a controversial change to its formula, according to drinks maker AG Barr.

The company has reported a 5% rise in revenue to £136m over the last six months.

It follows calls to boycott Scotland's "other national drink" after AG Barr removed more than half of its sugar.

Chief executive Roger White said: "We have delivered strong top-line growth in a period of considerable marketplace volatility and change."

"Our growth across core brands is especially encouraging," he added.

AG Barr said the UK's soft drinks market had benefited from the recent hot weather.

However, it cautioned that the full effect of the soft drinks industry levy - better known as the sugar tax - is yet to be fully determined.

Irn-Bru's sugar content fell from 10.3g per 100ml to just 4.7g when AG Barr altered the famous formula in January, bringing it under the 5g limit mandated by the sugar tax.

Creating the new recipe cost the Cumbernauld company around £1.4m.