Burberry like-for-like sales jumped 13% in its first quarter due to the “exceptional performance” of its spring fashion range. 

Underlying retail revenue soared 18% to £339m in the three months to June 30.

Sales growth was driven by its investment in digital as footfall was “soft offline but grew strongly online”, according to Burberry, which said it had improved conversion rates over the period.

Burberry chief executive Angela Ahrendts said: “Spring/summer 2013 was a standout season driven by innovative marketing, cohesive monthly fashion groups and exceptional execution from all corporate and regional teams. 

“Looking forward, the macro outlook remains uncertain and we will continue to focus our investment on profitable high-growth opportunities by channel, region and product categories.”

Outerwear and large leather goods accounted for more than half of the growth. Men’s accessories and tailoring outperformed and its Prorsum and London collections increased penetration, according to the retailer.

Burberry achieved double-digit like-for-like growth in Asia Pacific and the Americas and high single-digit growth in Europe and the rest of the world.

Seven stores opened during the period including two in Shanghai. Burberry expects new openings to contribute to low to single digit percentage retail sales growth in its full year.

The retailer said it plans to “modestly increase” retail and wholesale operating margin, which was 17.1% last year, over the full year. It still expects adjusted first-half profit to be below last year’s total of £173m.