Blacks, the British outdoor retailer owned by JD Sports Fashion, is offering a discount of 15 percent on all in-store purchases to customers who drop off clothing or footwear for donation to The British Heart Foundation. Donations collected at Blacks' stores will be distributed to the foundation's 750 stores in the U.K. Blacks operates 58 stores in the country. The participating stores are located in Glasgow, Manchester, London and Aintree.