Question: when was the last time the saints played in london
[{'answer': 'October 1', 'provenance': [{'wikipedia_id': '15558076', 'title': 'NFL International Series', 'start_paragraph_id': 8, 'start_character': 3, 'end_paragraph_id': 8, 'end_character': 12, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'answer': '2016', 'provenance': [{'wikipedia_id': '15558076', 'title': 'NFL International Series', 'start_paragraph_id': 1, 'start_character': 190, 'end_paragraph_id': 1, 'end_character': 194, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]