Question: who played sarah hedley in when the boat comes in
[{'answer': 'Rosalind Bailey', 'provenance': [{'wikipedia_id': '2585088', 'title': 'When the Boat Comes In', 'start_paragraph_id': 21, 'start_character': 12, 'end_paragraph_id': 21, 'end_character': 27, 'bleu_score': 1.0, 'section': 'Section::::Regular cast.\n'}]}, {'provenance': [{'wikipedia_id': '2585088', 'title': 'When the Boat Comes In', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 92, 'bleu_score': 0.861173529963367, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 85350074659477802}, 'section': 'Section::::Regular cast.\n'}]}, {'provenance': [{'wikipedia_id': '2585088', 'title': 'When the Boat Comes In', 'section': 'Section::::Regular cast.\n', 'start_paragraph_id': 21, 'end_paragraph_id': 21, 'meta': {'evidence_span': ['Rosalind Bailey as Sarah Headley née Lytton (1977, 81 / Series 2-4 / 23 episodes', 'BULLET::::- Rosalind Bailey as Sarah Headley née Lytton (1977, 81 / Series 2-4 / 23 episodes)', 'Rosalind Bailey as Sarah Headley née Lytton']}}]}]