I have Researched the Bury Brothers (John & James) as they are part of my ancestry but only along the family line and not too much about all their business interests as they stretched from Sabden to Manchester/Salford to London and other places.
As Bob says you could look in the Bury Library and Historical society but I also found a raft of information about them in the National archive papers held at Manchester here's the link:
The National Archives | Access to Archives
You will have to arrange a time to see them at the offices in Manchester as they will bring the documents out of their archives which takes a few days.
Let me know if I can help further.
Regards,
A.Bury