Britain will spend a further 100 million pounds on humanitarian aid to address the Syrian refugee crisis, Prime Minister David Cameron said on Friday.<br />"Today I can announce that we will provide a further 100 million pounds, taking our total contribution to over 1 billion pounds.<br />That is the UK's largest ever response to a humanitarian crisis," Cameron told reporters during a visit to Spain.<br />"Sixty million pounds of this additional funding will go to help Syrians still in Syria.<br />The rest will go to neighboring countries, to Turkey, Jordan and Lebanon, where Syrian refugees now account for one quarter of the population."