Question: when was tv first broadcast in the uk
[{'answer': '1930', 'provenance': [{'wikipedia_id': '671734', 'title': 'Timeline of the BBC', 'start_paragraph_id': 47, 'start_character': 11, 'end_paragraph_id': 47, 'end_character': 15, 'bleu_score': 1.0, 'section': 'Section::::1920s.\n'}]}]