The last working mill on the Great Ouse, Houghton Mill, in its present incarnation, was probably built in the mid-seventeenth century. It was extended in the nineteenth century when it was under the ownership of Potto Brown and Joseph Goodman, both of whom were philanthropists as well as millers. The Brown family had run the Mill from 1797, but it was Potto who transformed the business and the working methods; the reasons for which were much influenced by his Quaker faith. The Mill, with only two twentieth-century painted views of Houghton, was decommissioned and given to the National Trust in 1939 by the Great River Ouse Catchment Board, in cooperation with the Borough Councils of Huntingdon and Godmanchester, and endowed by Lieutenant Colonel Louis Tebbutt, grandson of Mr Goodman. The Miller’s House and river frontage were acquired in 1982, chiefly through a gift from Miss Sheila Day.