Take a pint of freshly poured cold Carling and drink (neck) half of it in one. Pause for thought. Then with out stopping pour in the entire bottle of Reef and drink the remainder at your leisure.
The Reef should be poured in one; any spillages should be noted and acted upon appropriately. The key to the whole cocktail is knowing when there is enough room in the pint glass to pour in the entire bottle of reef, refilling it to the brim without any spillage.