Late 60s, I was on a dual-sortie from Shawbury in a Chipmunk, when a Valley Hunter came on the Local frequency. The pilot, who had a middle-eastern accent, was clearly having difficulties with the tower's instructions and my instructor, who was shocked by what he heard, switched over to Approach at the appropriate time to continue listening to the saga. The pilot continued to have difficulties when the controller was trying to vector him around a target "altitude unknown". We then saw a Hunter overhead and the penny dropped! A quick switch to Local and my instructor reported our position. The controller was not amused!