David Cameron has suggested there is still work to be done to find 'solutions' on Britain's re-negotiations on the EU. What might those solutions involve - and could young British workers find their benefits cut in order to achieve a deal with Brussels? Senior politicians and diplomats are gathering in New York to work out a potential UN resolution paving the way for a peace plan for Syria. Our chief international correspondent Lyse Doucet has recently returned from Damascus and offers her assessment. Also we hear from the dogs who are sniffing out cancer in humans and meet the steam enthusiasts who've saved a vintage railway for posterity.