Question: who played mr grainger in are you being served
[{'answer': 'Arthur Brough', 'provenance': [{'wikipedia_id': '877767', 'title': 'Arthur Brough', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 13, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '877767', 'title': 'Arthur Brough', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 271, 'bleu_score': 0.714207336631, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5305942009982775484}, 'section': 'Section::::Abstract.'}]}]