Share certificate recordkeeping: board-authorised printing, custodial responsibility, prolonged preservation and procedures for cancellation. Blank share certificate forms must be printed under Board authorisation, consecutively machine-numbered, and their printing materials and forms kept in the custody of the company secretary or another Board-authorised person who accounts to the Board. Maintenance and safe custody of all books relating to issue of share certificates is vested in a Board-authorised committee or the company secretary, or a specifically authorised Director if there is no company secretary. Books must be preserved at least thirty years (permanently if disputed); surrendered certificates must be defaced as 'cancelled' and may be destroyed after three years under Board resolution and appointed supervision, subject to a dematerialisation-related exception.