zoink
You mention "Irish".....well do not be put off . We have a high number of Scottish/Irish at Swanwick and they form the core of the "best". N.I. in particular has been a source of high-grade controllers for many years. The operational staff make-up at Swanwick covers a complete spectrum of ethnicities and the majority of relevant management is of Scottish origin. Regionality and accent is just NOT an issue. To put your mind at rest, imagine an airliner flying a long distance; how many countries and sets of controller accents will the crew encounter?...So you see...don't worry.