I dimly recall from my youth in Cornwall that it was a particular problem if the aircraft ended up too far west - they would leave the South Wales coast, cross

I dimly recall from my youth in Cornwall that it was a particular problem if the aircraft ended up too far west - they would leave the South Wales coast, cross the Bristol Channel - confuse that with the English Channel, and then land, lost, at the first airbase they found in Cornwall -thinking they were at least in France.