Free trade will kill the west. Along with unbridled 3rd world immigration. A nation must mine, manufacture and grow things or die.
Britain isn’t an island blessed with an abundance of natural resources (apart from lithium and tungsten which for which mines are being created).
Britain relies on countries not raising tariffs against the goods and services it generates.
America could in theory drop a bamboo curtain around itself and become self sufficient without trading with outsiders but that is not an option for Britain.