By Stefan Boscia Kwasi Kwarteng has said he will focus on “delivering the major parts of our growth package” in the wake of his U-turn on tax cuts for the UK’s highest earners, while insisting his plans are “not irresponsible”. The chancellor said that his mini-Budget 10 days ago “has caused a little turbulence”, but that “we are listening, and have listened”. Kwarteng’s stunning U-turn this morning came after the fiscal pacakge caused the pound to crash against the US dollar and for a deep sell-off of UK bonds. Sterling has since rebounded and is at similar levels against the US dollar as it …