Asos retail sales surged 45% in its third quarter to May 31 after it invested in lower prices and its country-specific websites generated “stronger growth”.

Within that, UK turnover at the online fashion giant jumped 39% to £64.3m while international revenue rocketed 48% to £129.3m.

International sales now make up 67% of the total, up on 65% last year.

Retail gross margin increased 10 basis points as Asos’s investment in price last year fed through.

Asos chief executive Nick Robertson said: “I am pleased to report another strong trading period for the three months to May 31, 2013 with total retail sales up 45% to £194m.

“Our UK sales grew by 39% as our customers continued to respond well to our price investments.

“We continue to see stronger growth in those countries where we have dedicated websites and in-country teams, notably in the US, France, Germany and Australia.”

Asos launched its Russian website on May 1. It is planning to launch in China in October.

Robertson added that the fourth quarter “should result in a small improvement for the year as a whole” and the full-year results will be in line with expectations.

The etailer is set to extend the Primark range which it launched on site last week from 20 to 100 items in the next few months.