I know a mate who wires and data networks office blocks. A small team of them get contracted from the UK to work in the big cities all over Europe. The lucky git seems to be working in Amsterdam for years now, flying back to the UK every 5 weeks for a short break. They work through the entire night and seems like a nice little self employed job if you like data wiring offices with the added bonus of travelling all over Europe and you don't need any qualifications as such to do it, just the ability to learn and wire certain control panels they work on. Seems like a very similar job as yours Stuart.
Yeah ive worked in data centres all over the country! I do HVAC work though, barclays bank have the Air Conditioning set at like 8C and freezes ya bollocks off when I got a panel in there!