Question: when did mcdonald's first come to britain
[{'answer': '1974', 'provenance': [{'wikipedia_id': '5671742', 'title': "History of McDonald's", 'start_paragraph_id': 19, 'start_character': 97, 'end_paragraph_id': 19, 'end_character': 101, 'bleu_score': 1.0, 'section': 'Section::::1960s and 1970s.\n'}]}, {'provenance': [{'wikipedia_id': '5671742', 'title': "History of McDonald's", 'start_paragraph_id': 123, 'start_character': 0, 'end_paragraph_id': 123, 'end_character': 151, 'bleu_score': 0.9181891462193901, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 882112386761844269}, 'section': 'Section::::Timeline.:1970s.\n'}]}]