The collection comprises:
- Signed minute book of general and board meetings, December 1936-January 1947 (BEN 1).
- Signed minute book of board meetings, January 1947-March 1948 (BEN 2).
- Signed minute book of general meetings, March 1947-March 1948 (BEN 3).
The minute books record the activities, finance and share ownership of the company. Only BEN 1contains significant references to the company's operational activity. This series of minute booksis incomplete. If earlier volumes survive, their location has not been ascertained.