Just use these, no more problems
http://www.toolstation.com/shop/Scr.../Torx-Fast+Multi+Purpose+Screw/p63292[/QUOTE]
I'm really going to show my ignorance here! I was wondering what exactly those bits were for. What's the difference between those and Pozi bits or when are you supposed to use those instead of Pozi?
Just had a look at the bit I was using and I'm embarrassed to say it was a Phillips!
They're a "Torx" head, they work like a star shaped allen key for want of a better description. The screw will stay on the bit to locate it, and it won't "cam out" like a pozi will. Good, but as already said, expensive and a PIA if you haven't got the right bit and need to take them out of someone else's work.
Sprogginz, those sets are OK, but you always end up buying stuff you don't use. Up to you of course.
Personally I have a couple of the "lock in" type bitholders, where you pull the sleeve back to take the bit out. Saves leaving the bit with the screw. I bought a pack of "gold" decent branded (can't remember) pz 2 bits ages ago, and I've got a couple of those little multi bit sets in bungy boxes. Cheap, and they cover the rest for me for the occasional one off use. One of them came with a little bit ratchet handle like in a socket set, and that is useful on occasion. I get masonry drills as I need them generally.
I will say that I've never been out on site driving hardened twinfasts all day though.