Question: where is britain's got talent semi finals held
[{'answer': 'Elstree Studios', 'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 20, 'start_character': 494, 'end_paragraph_id': 20, 'end_character': 509, 'bleu_score': 1.0, 'section': 'Section::::Format.:Semi-finals and Final.\n'}]}, {'provenance': [{'wikipedia_id': '8517686', 'title': "Britain's Got Talent", 'start_paragraph_id': 20, 'start_character': 0, 'end_paragraph_id': 20, 'end_character': 1132, 'bleu_score': 0.598188724552143, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1032779065152259295}, 'section': 'Section::::Format.:Semi-finals and Final.\n'}]}]