I was curious, as a former user of Speedotrons for stadium sports work, what do you use them for?
I'm assuming it's something requiring short flash durations?
There are lots about here in the U.S, but it's the shipping that would kill you...they are over 35 pounds each
per pack! Have you contacted Speedotron? Perhaps they have a dealer or large customer in Northern Ireland
or someone who does repairs there that might have a line for you...
We called them "Widow Makers"...I once had a pack arc and it made such a loud bang, our ears rang
for hours! I used to assist a Sports Illustrated photographer, and we used them in Madison Square Gardens
in NY to shoot Hockey, and also shooting basketball...when I first learned the packs, he told me to
"Always discharge before you pull out". Still brings a smile to my face.