Question: who played guitar on walker brothers no regrets
[{'answer': 'John Walker', 'provenance': [{'wikipedia_id': '21495118', 'title': 'No Regrets (The Walker Brothers album)', 'start_paragraph_id': 2, 'start_character': 293, 'end_paragraph_id': 2, 'end_character': 304, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Judd Proctor', 'provenance': [{'wikipedia_id': '21495118', 'title': 'No Regrets (The Walker Brothers album)', 'start_paragraph_id': 6, 'start_character': 25, 'end_paragraph_id': 6, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Personnel.\n'}]}, {'answer': 'Len Walker', 'provenance': [{'wikipedia_id': '21495118', 'title': 'No Regrets (The Walker Brothers album)', 'start_paragraph_id': 6, 'start_character': 39, 'end_paragraph_id': 6, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::Personnel.\n'}]}, {'answer': 'Scott Walker', 'provenance': [{'wikipedia_id': '21495118', 'title': 'No Regrets (The Walker Brothers album)', 'start_paragraph_id': 2, 'start_character': 277, 'end_paragraph_id': 2, 'end_character': 289, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Alan Parker', 'provenance': [{'wikipedia_id': '21495118', 'title': 'No Regrets (The Walker Brothers album)', 'start_paragraph_id': 7, 'start_character': 12, 'end_paragraph_id': 7, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Personnel.\n'}]}, {'answer': 'Ritchy Hitchcock', 'provenance': [{'wikipedia_id': '21495118', 'title': 'No Regrets (The Walker Brothers album)', 'start_paragraph_id': 13, 'start_character': 12, 'end_paragraph_id': 13, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Personnel.\n'}]}]