What episode number is presented by Ben Okri ?
{'header': ['Episode No.', 'Episode Title', 'UK Broadcast Date', 'Presenter', 'Countries Visited'], 'page_title': 'Great Railway Journeys', 'page_id': '', 'types': ['text', 'text', 'text', 'text', 'text'], 'id': '1-15211468-3', 'section_title': 'Series 3:   (1996)', 'caption': 'Series 3:   (1996)', 'rows': [['#3.1', '"Crewe to Crewe"', '1996-09-04', 'Victoria Wood', 'United Kingdom'], ['#3.2', '"Aleppo to Aqaba"', '1996-09-11', 'Alexei Sayle', 'Syria , Jordan'], ['#3.3', '"Great Zimbabwe to Kilimatinde"', '1996-09-18', 'Henry Louis Gates Jr.', 'Zimbabwe , Zambia , Tanzania'], ['#3.4', '"The High Andes to Patagonia"', '1996-09-25', 'Buck Henry', 'Argentina'], ['#3.5', '"Mombasa to the Mountains of the Moon"', '1996-10-02', 'Benedict Allen', 'Kenya , Uganda'], ['#3.6', '"London to Arcadia"', '1996-10-09', 'Ben Okri', 'England, France, Switzerland , Italy , Greece']], 'name': 'table_15211468_3'}