Question: when were bank holidays introduced in the uk
[{'answer': '1871', 'provenance': [{'wikipedia_id': '158268', 'title': 'Bank holiday', 'start_paragraph_id': 8, 'start_character': 83, 'end_paragraph_id': 8, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '158268', 'title': 'Bank holiday', 'start_paragraph_id': 8, 'start_character': 87, 'end_paragraph_id': 8, 'end_character': 1025, 'bleu_score': 0.988200073497952, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4510106286929777533}, 'section': 'Section::::History.\n'}]}]