Presentment unnecessary where a payor prevents or accepts liability for non presentment, so the instrument is dishonoured at due date. Section 76 provides that presentment for payment is unnecessary and the instrument is dishonoured at the due date where the maker, drawee or acceptor prevents presentment or is absent from the place of payment; where a party has engaged to pay notwithstanding non presentment; where, after maturity, a party with knowledge of non presentment makes part payment, promises to pay, or waives presentment; and where the drawer could not suffer damage from lack of presentment.