Wilfred Middlebrook, in The Changing Face Of Warminster, first written in 1960, updated in 1971, noted:
There is an odd ghost story associated with the mill house [at Boreham Mill, near Warminster]. An unseen ghost leaves wet footprints on the bedroom stairs on every Friday the 13th. It is reputed that, many years ago, when sacks of corn were exchanged for sacks of coal brought by pack horses from Radstock, the miller was found to be swindling his clients. So they put his head between the millstones and threw his body into the mill dam. The mill house, like Boreham Mill, has been rebuilt more than once, on burnt-out foundations, but the wet footprints of the headless miller still appear on their way from the mill dam, through a now walled-up doorway, and up the stairs to the bedroom – or so it is said!