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Thank you @Tom W. & @zoomer. This is the correct answer: ESPG: 2157 -IRENET95 / Irish Transverse Mercator
Luckily, in this case, the difference between the default and the site was significant - pointing up the error and the importance of setting the correct coordinate system.
I originally searched for 'Ireland' and didn't get any results. This would be a helpful VW improvement to tag the country along with the name of its coordinate system/s so that searches are more reliable.