From what I've seen of them, the DIY shows over here don't really get into electrical issues that deeply. They'll talk about what style lights to fit, and sometimes we'll see their lek-trish-un connecting a few downlighters or something like that, but only briefly and not in detail. Given the misleading and sometimes plain incorrect information I've seen in some books and DIY video guides, that's probably a good thing.
In all of the junction boxes in this attic - none of the wires were twisted in the wire nuts - Therefore, for safety reasons we're not going to take any chances - we're going to replace all the wiring.
Hey, I just replaced my outside light because a seal had gone and water had gotten in causing some damage.
Now you tell me that I should have rewired the whole house instead of just replacing the water-damaged piece of cable!