survey and the 1858 OS map indicates 'stepping stones' here (the old weir) and a ford a hundred metres or so upstream. A building is indicated, which may have been the grain store on the other side of the river, the ford would have provided easy access. A track from here, the grain store, to High Chapeltoun is shown on one of Aitken's maps. Ploughing in this field did not bring up any stones, suggesting that this was a wooden building. Running from nearly opposite the present entrance to Townhead of Lambroughton is what appears to have been a lane in 1829, leading directly to a mill, from Townhead of Lambroughton with hedgerow banks on either side. Grain could have been easily lowered down or flour hauled up from this lane's termination. This lane and the one to the mill site are clearly shown on the 1895 OS map, published in 1897. Laigh Castleton could also have been the miller's dwelling and farm, however it does not appear on a map by name until around 1828 and it is missing from Aitken's in 1829; the 1775 map has a building indicated, but it is named Mill, despite being set well back from the river. The name Mill could be interpreted as meaning that Laigh Castleton was linked with a mill though being the miller's dwelling. A 1779 Estate map of Lainshaw shows that lands to the East of the lane to the supposed mill belonged to Lambroughton. Thirlage was the feudal law by which the laird could force all those farmers living on his lands to bring their grain to his mill to be ground. Additionally they had to carry out repairs on the mill, maintain the lade and weir, as well as conveying new millstones to the site. The Thirlage Law was repealed in 1779 and after this many mills fell out of use as competition and unsubsidised running costs took their toll. This may explain why no sign of the mill is visible on Thomson's 1828 map, Aitken's 1829 map, or the 1858 OS map. Other mills, such as Dalgarven Mill near Kilwinning, survived almost to the present day through a mixture of luck, a reliable water supply and investment at the right time. Dalgarven Mill is now a museum. The last unrestored working mill in Ayrshire was Coldstream near Beith which last worked in 1979; the last