Question: what form of measurement does the uk use
[{'answer': 'imperial unit', 'provenance': [{'wikipedia_id': '15492', 'title': 'Imperial units', 'start_paragraph_id': 1, 'start_character': 14, 'end_paragraph_id': 1, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'metric', 'provenance': [{'wikipedia_id': '15492', 'title': 'Imperial units', 'start_paragraph_id': 1, 'start_character': 481, 'end_paragraph_id': 1, 'end_character': 487, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '15492', 'title': 'Imperial units', 'start_paragraph_id': 28, 'start_character': 0, 'end_paragraph_id': 28, 'end_character': 377, 'bleu_score': 0.9669306597086381, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2719325171597363934}, 'section': 'Section::::Current use.:United Kingdom.\n'}]}]