Question: when did the uk start changing the clocks
[{'answer': '1916', 'provenance': [{'wikipedia_id': '2439010', 'title': 'British Summer Time', 'start_paragraph_id': 6, 'start_character': 65, 'end_paragraph_id': 6, 'end_character': 69, 'bleu_score': 1.0, 'section': 'Section::::Instigation and early years.:Early history.\n'}]}, {'provenance': [{'wikipedia_id': '2439010', 'title': 'British Summer Time', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 400, 'bleu_score': 0.8414338051632461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8969436949444504054}, 'section': 'Section::::Instigation and early years.:Early history.\n'}]}]