Douglas Sannachan

Douglas Sannachan is a Scottish actor most widely known for playing Billy the window cleaner in Gregorys Girl. His famous line was If I dont see you through the week, Ill see you through a window. He grew up in the Calton area of Glasgow and was a pupil at John Street Secondary School, Glasgow. When he wasyears old he was the subject of a chapter of a book called The Year of the Child by Bel Mooney.

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Source: Wikipedia