Those ones you put in with two 4 inch nails and there safe as houses the ones in Scotland are completely different our have like a large spike on them thats hit into the rafter
have the windows taken out , form a tile batten on the inside of the window where the window stops on the inside form your lead up over that and it will have to be wielded in all the corners put your windows back in hay presto sorted
They arent i used ones similar when i was working in newyork except they where adjustable for the angle also.You could probs get them shipped from here http://josephjenkins.com/store/home.php
note guy in video is using an american slate hammer/cutter British tools are slightly different you can pick up a set of traditional slate working tools for about 50 pounds as much as a drill if not cheaper also every slate should be holed from the back/bed of the slate this will give you a...
Dont use any sticky crap all your doing is joining all the slates together and they will fall out in one big clump. If your wanting into the fascia start at the third course from the gutter get a slate ripper and slide it up to take the third course out this will let you into the next two...
you see the sand paper part of the tray in the valley the tiles should finish there like on the outside edge of it i think he may have cut the tiles short that's how you can see the battens