This document explains the importance of development aid and the reform and reinforcement of public structures. These aim to improve the welfare of citizens of developing countries and promote economic development in order toreduce suffering and eliminate poverty.
From the letter: "We are greatly encouraged by the UK government’s aid increases in 2008 and its commitment to deliver £7,477m in aid during 2009/10; we hope you will be sticking firmly to these plans in the 2009 budget..."