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High Sim is the name once given to a picturesque house which overlooks Burwains. There were at least five cottages there, two at High Sim and three a few yards down the lane at Lower Sim. In addition there has also been a Methodist Chapel and Sunday School at High Sim. The name probably comes from the Simpson family who lived in one of the cottages. To this day one of the fields is called Simpson Pasture, a close which the Briercliffe family owned until the eighteenth century.
From "A Lancashire Township. The History of Briercliffe-with-Extwistle". Roger Frost