1. A method of counting the value of a plurality of currency documents, each currency document having disposed thereon or therein coded data including a plurality or coded data portions, each coded data portion being at least partially indicative of an identity of the currency document, the method including, in a sensing device: sensing at least one coded data portion for each currency document; determining a scanning time at which the sensing device sensed the coded data portion of each currency document; determining, from the sensed coded data portion and determined scanning time, a unique identity of each currency document; determining, using each determined identity, a value for each currency document; and, counting the value of the currency documents using the determined values.