Question: when did epcs come into force for rental properties
[{'answer': '1 October 2008', 'provenance': [{'wikipedia_id': '10181384', 'title': 'Energy Performance Certificate (United Kingdom)', 'start_paragraph_id': 3, 'start_character': 509, 'end_paragraph_id': 3, 'end_character': 523, 'bleu_score': 1.0, 'section': 'Section::::Legislative history.\n'}]}, {'provenance': [{'wikipedia_id': '10181384', 'title': 'Energy Performance Certificate (United Kingdom)', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 797, 'bleu_score': 0.9223929970193581, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2587880960211138016}, 'section': 'Section::::Legislative history.\n'}]}]