The Competition and Markets Authority (CMA) has accepted binding commitments from Certas Energy and DCC plc which aim to improve competition in the supply of petrol and diesel to filling stations in the Western Isles of Scotland. The commitments bring an end to contracts which provided for many filling stations on the islands to buy fuels exclusively from Certas for five years. Filling stations will now have greater flexibility to choose whether or not they purchase fuels from Certas, and the terms of those arrangements.