A miller was mentioned in the Lechmere Tax Rolls for Weleye and Selleye in 1276-82. An archaeological excavation identified that the straightening of the Bourn Brook and the construction of the mill leat suggests that the site of the Bourn Brook Mill was medieval in origin and that a mill or mills had existed in roughly the same location for 500–600 years. Deposits from the relict water channels were radiocarbon dated to the 15th and 16th centuries. The fishponds that the leat drained into would also have to be of late medieval date. Further opportunity to discover the location of the medieval mill will be useful to inform the local and regional research cycles.