Back in the early 70s we had a Jodel based at our field 1050? The engine was always a bit tired for the hours and the owner rented it out sometimes.
So, I get a call from an Essex airfield saying that several blokes of Asian looks were seen getting out of it and dissapearing into a waiting car. Sort of explained the engine being a bit tired as they were exceeding the MTO and flying across the N. sea at high power setting. Told the owner and he limited the people who he rented to
We heard of several others doing such trips at the time.