/english/file/get/d9dbc0d6-3a0f-44ce-b3c2-ad5c7df023d1%%%From Balfour to Boris: Britain's broken promises in Palestine%%%The long read: In its centenary year, Professor Avi Shlaim examines the impact of the Balfour Declaration and Britain's 'deviousness, duplicity and double-standards' in Palestine, writes Ben Clarke.%%%Comment