sentences:  An annexe was built for porcelain production at the Cambrian Pottery, where Walker and Billingsley were based from late 1814.During this time, Young was preoccupied with the construction of the Tomb of Thomas Mansel Talbot, at Margam Abbey.Billingsley's porcelain recipe was modified and improved, but was still wasteful enough for Dillwyn to abandon the project in Swansea and in 1817, the pair returned to Nantgarw.