Question: how many miles is the length of britain
[{'answer': '874 miles'}, {'provenance': [{'wikipedia_id': '3013246', 'title': "Land's End to John o' Groats", 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 440, 'bleu_score': 0.8471170982956461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16815512676393792614}, 'section': 'Section::::Abstract.'}]}]