The Finningley JP5s were unmodified with the spin stakes and roughened leading edges, unlike the Mk5As used for pilot training. This gave them a lower fuel consumption in the order of 5lbs a minute at low level, which was significant, and with the tip tanks increasing the fuel load to about 2600lbs, the range was improved at low level. Some Mk5As were transferred to Finningley when they were released by the introduction of the Tucano, they were fitted with tip tanks and known as Mk5Bs, but they retained the strakes and the leading edges. In about 1993, they were replaced by Tucanos.