I think I have solved the mills at Lea Marston, why on earth I didn't check this first is mind blowing, here goes:
"There was a mill at Marston in 1086, and there was one attached to the manor of Lea Marston in 1703. The later may have been at Ouston Grange, on the south-east edge of Hams Park, an estate which had been given to the Abbey of Merevale before 1221 and on which there was in 1291 a mill worth 4s. After the Dissolution of the lands of Merevale, including Ouston with two mills, were given to Walter Devereux, Lord Ferrers of Chartley, whose descendants sold the estate to Charles Adderley, Lord of Lea Marston in the 17th century."
Taken from British History
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"There was a mill at Marston in 1086, and there was one attached to the manor of Lea Marston in 1703. The later may have been at Ouston Grange, on the south-east edge of Hams Park, an estate which had been given to the Abbey of Merevale before 1221 and on which there was in 1291 a mill worth 4s. After the Dissolution of the lands of Merevale, including Ouston with two mills, were given to Walter Devereux, Lord Ferrers of Chartley, whose descendants sold the estate to Charles Adderley, Lord of Lea Marston in the 17th century."
Taken from British History
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