Question: when did the waltz become popular in england
[{'answer': 'the Regency period', 'provenance': [{'wikipedia_id': '32895', 'title': 'Waltz', 'start_paragraph_id': 11, 'start_character': 40, 'end_paragraph_id': 11, 'end_character': 58, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '32895', 'title': 'Waltz', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 1033, 'bleu_score': 0.938433124713522, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9718543229247530376}, 'section': 'Section::::History.\n'}]}]