In order to ship a package to UK that weighs 6lbs. will cost the least dimensions must be LENGTH 12in., WIDTH 4in. and HEIGHT 7 ( those are examples of measurements I put in) it would cost you, $105.25, Global Express. Or with the same sample measures, the other options are. Express Mail?? International $54.75,Priority Mail$42.50,Priority Mail International Large Flat-Rate Box $53.95,and or Priority Mail Regular/Medium $41.95. These prices are through the United States Post Office.