Clothing retailer Primark, are set to release sales figures which show an 11% rise in total sales in the half a year up to March 4th. The actual amount of the increase with exchange rates taken into account, is closer to 22%. Much of the success was attributed to increased retail selling space, which had risen by 12% in the 6-month period. In spite of this, the company warned that operating margins will begin to fall due to the decrease in the value of the pound and the increased performance of the dollar in the market.