I've never heard of spies being landed in Britain by aircraft. Remember with the Lysander flights there was always a friendly reception committee in occupied France. The only practicaly way to land spies in an enemy country was to parachute in or by sub. Spies were caught in Britain during the war. They must have come in by some means.
Going back to the German spies landed in Ireland. One they dropped in was Indian!!???
Even today an Indian wandering around rural Ireland would cause comment. What were they thinking?