Online fast fashion retailer Boohoo has posted a surge in sales along with further growth in its active customer numbers.

The etailer recorded a 41% rise in revenues to £58.2m in the three months to March 31, when active customer numbers climbed 30% year on year to 4.2 million.

Gross margin was down 300 basis points to 57.6% as the retailer invested in lower prices and business improvements. That fall was offset by reduced spending on marketing.

The retailer said profitability has improved as a result of the reduction in marketing costs.

Boohoo bosses now expect full-year sales growth of between 25% and 30%.

Joint chief executives Mahmud Kamani and Carol Kane said: “We expect EBITDA margins in line with last year, although we will look at opportunities to drive incremental growth by investing in the customer proposition and our international markets.

“We continue to execute on our strategy and refine our ecommerce platform to deliver a market-leading shopping experience for fashionable product at incredible prices.”