There's an analysis of the extent of finds published in The Changing Face of Liverpool 1207-1770, by the Merseyside Archaeological Society 2007.
It says "Pottery was produced in south west Lancashire during the Medieval period but evidence for earthenware manufacture in Liverpool is not found until early in the eighteenth century, when Samuel Shaw established a pottery on the slope of the hill which became known as Shaw's Brow (William Brown Street). The early Liverpool pottery was of the Dutch type of tin-glazed earthenware, with a coarse body and thick white or blue glaze, commonly known as Delft.
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By 1766 there were six potteries in Shaw's Brow [this must be from the 1766 trade directory] and a futher eight potteries in town, including Alderman Thomas Shaw, the son of Samuel"
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