Question: when was the first tower block built in england
[{'answer': '1951', 'provenance': [{'wikipedia_id': '54309908', 'title': 'Tower blocks in Great Britain', 'start_paragraph_id': 1, 'start_character': 159, 'end_paragraph_id': 1, 'end_character': 163, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54309908', 'title': 'Tower blocks in Great Britain', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 649, 'bleu_score': 0.933878615794643, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5154356748048665958}, 'section': 'Section::::Abstract.'}]}]