Question: when was the abolition of slavery in britain
[{'answer': '1 August 1834', 'provenance': [{'wikipedia_id': '1811656', 'title': 'Slavery Abolition Act 1833', 'start_paragraph_id': 11, 'start_character': 216, 'end_paragraph_id': 11, 'end_character': 229, 'bleu_score': 1.0, 'section': 'Section::::Act.\n'}]}, {'provenance': [{'wikipedia_id': '1811656', 'title': 'Slavery Abolition Act 1833', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 764, 'bleu_score': 0.962886534286689, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10259984860150903395}, 'section': 'Section::::Act.\n'}]}]