The powers conferred upon Her Majesty in Council by section four hundred and twenty-one, sub-section (2), of the M1Merchant Shipping Act 1894, shall extend to and include the power to make rules concerning lights and signals to be carried or the steps for avoiding collision to be taken by vessels navigating the sea channels or approaches to the River Mersey between the Rock Lighthouse and the furthest point seawards to which such sea channels or approaches respectively are for the time being buoyed on both sides.