Question: when did they stop national service in the uk
[{'answer': '31 December 1960', 'provenance': [{'wikipedia_id': '17559006', 'title': 'National Service Act 1948', 'start_paragraph_id': 12, 'start_character': 121, 'end_paragraph_id': 12, 'end_character': 137, 'bleu_score': 1.0, 'section': 'Section::::Ending in 1963.\n'}]}, {'provenance': [{'wikipedia_id': '17559006', 'title': 'National Service Act 1948', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 205, 'bleu_score': 0.943604326170661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15609329995880917758}, 'section': 'Section::::Ending in 1963.\n'}]}]