Had a lovely ride-on mower at Wyton early 90s for the big OMQ - which had very big back gardens. Our then 3 year-old loved sitting on my lap to drive it - 3 years later with me now a civilian and living in Devon, the boy was in the car on his own for a few seconds and released the hand brake. His mower driving experience probably saved his life as, he explained, he steered the car into the gate rather than across the lane into a bank and ditch. Glad he did not get hurt - now a Yachtmaster Ocean and a graduate in yacht construction and survey.