AG Barr has claimed a “robust” performance over the past three months despite the wet April and wider gloom on the British high street.

The Irn-Bru maker said sales for the 14 weeks to 5 May were up 4.3% over the equivalent period last year.

“In the period we have continued our strategy of investing in long-term brand building while delivering value for consumers,” the soft drinks group said in its latest trading statement.

It pointed to television and online advertising for the flagship Irn-Bru brand as well as the first national TV campaign for juice brand Rubicon.

“We have started the new financial year with all of our core brands performing well in difficult market conditions,” the company said.

“During the course of the period the unseasonal weather for the time of year has impacted the market and a period of more normal conditions will now be required to bring the market back into growth.”