AG Barr, the soft drinks manufacturer behind Irn Bru, has reported a 4% increase in revenue for the first 13 weeks of the financial year.

Revenue performance in core carbonate brands, particularly in Irn Bru, had been strong and overall sales had benefited from new products including Rockstar, Taut, Vitsmart and the St Clement's fruit drinks and smoothie range, AG Barr said.

Continued pressure from rising raw material prices had been offset by product increases, the company added.