Piotr Antoni Glas (61) was convicted of three counts of committing an act of gross indecency after a trial last year.
This week, the Court of Appeal ruled that there were grounds for a retrial – the date for which has not been set.
Advocate Simon Thomas was representing Mr Glas. Crown Advocate Carla Carvalho represented the Crown in court.
The Rt Hon James Wolffe KC was presiding over the Court of Appeal. Judges Dame Julia Macur JA and Mr Samuel Grodzinski KC JA were sitting.