I think I am related from this family, at some point there were 2two brothers who ran the mill. I think the brother who did not have any descendants owned the mill. I did visit in the 1980s and met a lady who used to work in the Mill in the 1950s. I think there was a Calvert house.
On this subject which can be a bit of a mine-field I would like to state that I have not knowingly breeched any copyright and if found that I have I will be happy to discuss the issue with the owner hopefully to come to a happy solution and if this is not possible I will immediately remove any offending material.