Britain fined the country's largest sportswear retailers JD Sports and Footasylum on Monday a combined 4.7 million pounds ($6.4 million) for breaching an order that prevented both the merged firms from integrating further.

The Competition and Markets Authority (CMA), which had last year ordered JD to unwind its purchase of Footasylum due to competition concerns, said the two companies had exchanged commercially sensitive information in breach of its order.