There is provided a corrugated sheet processing apparatus (120) comprising: a control system; and downstream processing equipment, the downstream processing equipment comprising at least feed and guide rollers for moving or supporting a corrugated sheet and at least one cutting apparatus (148) for cutting products (146) from the corrugated sheet; wherein: the control system is for controlling at least the cutting apparatus (148); the sheet processing apparatus further comprises a visual inspection unit (162) arranged for reading printed information markers provided on the corrugated sheet as the corrugated sheet, and thus the printed information markers to be read, pass through the corrugated sheet processing apparatus (136) past the visual inspection unit (162); and the control system further has a data look-up table comprising at least information associated with the products (146) to be cut from the corrugated sheet, including cutter settings for the at least one cutting apparatus (148) for those products (146), and associated with those settings specific identifier information readable from the printed information markers by the visual inspection unit (162), whereby the apparatus can identify required cutter settings for the cutting apparatus (148) for the read printed information markers so that the cutting apparatus (148) can be appropriately controlled by the control system in response to a read printed information marker to provide a change in the cutter requirements.