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The siblings were respected and liked in the community and were active members of nearby Rhydwilym Chapel.Both had lived at Ffynon Samson with their elderly father until his death in 1967. They continued running the farm into the 1970s before retiring and renting land out.

Anne Gibby, whose father Emlyn was also a cousin of the siblings and saw the gruesome scene, said: "From what my father said about the scene, he felt it was physically impossible that he had done it."It stayed with him all his life and he talked about it until his dying day, that there was no way Griff had done it."It is a view with which many in the community agree. They point to details about the case which many feel cast doubt on Det Ch Supt Molloy's conclusions.

Griff was last seen at the local shop, Charing Cross, on the afternoon of Tuesday, 7 December, and it is believed that he and Patti died that evening.Two half-drunk cups of tea, and a plate of bread and butter and crisps were found in the living-room - fuelling speculation that someone else had visited the house that evening.

The cheese and newspaper Griff bought at the shop were still in the pocket of the jacket he was wearing when he died.

A large quantity of Griff's blood was found inside Patti's sewing machine, with the cover replaced - part of a left thumbprint found in blood on the cover was never identified.Sister Carr, 50, said: "It's highs and lows and aches and pains, but on the whole it is absolutely amazing."

Talking from Corbeny, in France, she said lots of people had been helping along the way, and "feeding me up"."The feet are a little bit sorer than I thought they would be - I have had to go through about three packs of plasters.

"At the beginning I thought 'am I really going to be able to do this?' But, it's manageable," she said.Sister Carr said she had been staying in homes, monasteries or parish centres, and "meeting all sorts of people".