IRFU referee Jonny Erskine is one who has benefitted from his experiences in the Celtic Cup refereeing five games across the seven week competition including an effective pool play-off between Leinster and Munster at Energia Park and the subsequent final between Leinster and Scarlets in Wales. Back refereeing in the AIL Erskine took charge of the Div1A top of the table clash between Clontarf and Cork Constitution at Castle Avenue last weekend.