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Thankyou to all the answers- I think three of the 4 answerers were valid and youve helped me understand the expression. I know I didnt give any context (I perhaps should of) but it was for a newspaper article . The fact that it was a Sunday was not important apart from maybe serving as a reference point for somebody reading the article in the future (i.e when yesterday was not a Sunday). This was the best option in my case. 4 KudoZ points were awarded for this answer