In reply to Rob Davies:
I worked as a cell-tower climber in Canada during the '4G gold rush' and it's the easiest climbing you could ever do (basically a 1300ft ladder with a bit of maneuvering at the top).
We had monthly H&S courses and the trainer actually showed us this video in one. It was filmed in the US a few years ago, when their industry rules were pretty much non-existent. It took wining the award of 'Americas deadliest job' before they caught up with the rest of the world. If this guy was caught climbing like that today he'd be kicked off site, but a lot still climb like that to save time in the knowledge that nobody can see them anyway.
Still no IRATA requirement over there. I was taught by the rest of the crew on the job (a lot of jocks funnily enough!).