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A classic example of a two-mill site, where a second mill has been added to augment the original as trade expanded. The original mill became No.1, with the new mill becoming No.2.
The mills were operated by the Bee Hive Spinning Co Ltd, which seems to have retained its independence of other groupings until the mills closed around 1960. They are now used as a mail order warehousing and distribution centre.
The mills were Listed Grade II in 1996 and are currently in good order.

Listed buildings and structures are officially designated as being of special architectural, historical or cultural significance. There are over half a million listed structures in the United Kingdom.
Listed status is more commonly associated with buildings or groups of buildings, however it can cover many other structures, including bridges, headstones, steps, ponds, monuments, walls, phone boxes, wrecks, parks, and heritage sites.

There are three main listing designations;
Grade I (2.5%) - exceptional interest, sometimes considered to be internationally important.
Grade II* (5.5%) - particularly important buildings of more than special interest.
Grade II (92%) - nationally important and of special interest.

There are also locally listed structures using A, B and C designations.

…read more at wikipedia Link