A good excuse to 'wheel out' one of my favourite photos, courtesy of the Royal Naval ND Association
To better train the Direction Officers in the practical skills of interception, a Fighter Direction Training Centre (FDTC) was established at the Naval Air Station at Yeovilton in 1941. Operational activities at Yeovilton forced the FDTC shortly afterwards to move to nearby Speckington Hall. Due to the shortage of both radar and aircraft with which to practise, a heavy reliance was placed upon teaching the principles, and included the use of Walls ice cream tricycles, one being an "enemy aircraft" and another being a "friendly fighter". The Direction Officer could see both "aircraft" and would pass the necessary directions for the "fighter" to close and intercept the "enemy".