Question: when did guns become illegal in the uk
[{'answer': '1997', 'provenance': [{'wikipedia_id': '450950', 'title': 'Firearms regulation in the United Kingdom', 'start_paragraph_id': 13, 'start_character': 4, 'end_paragraph_id': 13, 'end_character': 8, 'bleu_score': 1.0, 'section': 'Section::::Legal classification.:Pistols.\n'}]}, {'provenance': [{'wikipedia_id': '450950', 'title': 'Firearms regulation in the United Kingdom', 'start_paragraph_id': 94, 'start_character': 0, 'end_paragraph_id': 94, 'end_character': 1319, 'bleu_score': 0.9902197551206561, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2750426627139630209}, 'section': 'Section::::History.:Firearms legislation in the United Kingdom.:1997 Firearms (Amendment) Acts.\n'}]}]