<Li> Fingringhoe Tide Mill, Fingringhoe, Essex (house converted) </Li> <Li> Battlesbridge Tide Mill, Battlesbridge, Essex (converted for business) </Li> <Li> Thorrington Tide Mill, Thorrington, Essex </Li> <Li> Eling Tide Mill, Eling, Hampshire (working) </Li>

Who invented the tidal mill in the middle ages