The Willebrew ticket system, patented by Williamson's of Ashton-under-Lyne, Lancashire, was in use at both Stainforth ans Armthorpe depots for many years and survived at Stainforth almost until the end.  It used pre-printed tickets which included the complete range of fares on one ticket.  The conductor carried an enclosed guillotine which snipped off the ticket at the appropriate price and printed it with a "stage boarded" number.  The snipped-off sections of ticket were retained inside the machine (sealed at the office) and together with a simple way-bill on which the current ticket serial number was noted at various stages of the journey, the bus company were provided with a check on the cash taken and a complete picture of how many passengers had boarded in various sections and their destinations.

    This simple technology coped admirably with the change to decimal currency which took place in the UK in 1971.  All that was required was a change to the stock tickets to incorporate the new currency.  Eventually, the dual-priced tickets were used up, and decimal-only style tickets took their place.  More sophisticated systems, including those which printed tickets on issue had to be modified at great expense or even replaced completely.