My J-shaped twin-track plough of the grass at Helston International using HM's finest single-turbine powered rotary trainer stands out in my memory. EOLs never had the same appeal thereafter. I believe the scars in the turf have only just faded and are no longer visible on Google Earth some thirty six years on.
Still, the QHI in the RHS saw it as good preparation for his later gallantry. He was awarded the DSC for his work over Sir Galahad.