Can any "Do-it-Yourselfers" tell me by what name you call the self-tapping screws that have a small "post" in the centre thus preventing you getting a polydrive or philips screwdriver into it to either screw or unscrew. When I know the name of the screw I will be able to locate a screwdriver....Many thanks....Telboy
Your local hardware shop should be able to help you out with a security bit set which have all the common bits.
If you have a screwfix trade centre near you you can pick up a set for �4.99. http://www.screwfix.com/app/sfd/cat/pro.jsp?id =18983&ts=06508