On Friday, in the Bethel Methodist Chapel in Angelsey, the funeral was held of Gareth Williams. In life, he was a mathematician and an encryption specialist so highly regarded that he was seconded from GCHQ in Cheltenham to work at MI6 in London.
In death, he is an enigma, an infuriating mystery for most of us, a deeply upsetting puzzle to his parents; for, though his body is now laid to rest, the questions about the bizarre way he met his end show no sign of being buried. Yesterday brought another theory, something this saga has attracted as a September orchard does wasps.

The facts are these. Gareth Williams was 31, studied mathematics at Cambridge, was recruited by the government's listening and monitoring operation in Gloucestershire, and was lent for a year to MI6. He moved to London last September, lived in a five-storey security services safe house at 36 Alderney Street, Pimlico, worked on matters such as computer security involving the City, and led, as far as police can tell, a rather introverted existence

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