Question: who plays alan in last tango in halifax
[{'answer': 'Sir Derek Jacobi', 'provenance': [{'wikipedia_id': '37968330', 'title': 'Last Tango in Halifax', 'start_paragraph_id': 1, 'start_character': 267, 'end_paragraph_id': 1, 'end_character': 283, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '37968330', 'title': 'Last Tango in Halifax', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 763, 'bleu_score': 0.984062469849008, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15001138845350402449}, 'section': 'Section::::Abstract.'}]}]