UK retail giant Debenhams has announced plans to invest in its online business and quadruple sales in the channel to £500 million over the medium term.

In its latest results, the company said that it had achieved a 34.7 percent growth in online sales for the half-year to 3 March 2012, bringing total online sales to £124.3 million.

It said that it uses online sales as a "proxy for the growth of the multi-channel business as a whole", and it aims to grow online sales to £500 million over the medium-term.

With 20 percent of online traffic now generated by mobile devices, Debenhams described mobile as its "fastest growing channel".

The retailer is also planning to grow its international business, and it largely expects to do this through international online delivery. During the first half it increased the number of countries it delivers to from seven to 40, which will rise to 67 by the end of the summer. 

Of the £500 million medium-term target, it expects 20 percent will be generated by international online delivery. 

Debenhams is also planning to launch its first local language, local currency website in Germany in May 2012, which has been facilitated by a recent investment in IBM’s Wepshere 7 platform. A results statement said that this website will be “followed by a number of other sites over the coming months”. 

In September last year it was revealed that Debenhams was deploying upgraded HP servers at 100 stores across the country to comply with payment card regulations and improve transaction processing in a virtualised environment. 

Debenhams was having to install the new HP ProLiant servers to meet the regulatory demands set by the Payment Cards Industry guidelines when acquiring credit card information during customer transactions.