Hi Graham, please post a picture of the "funny" screw head so we can see what they look like and point you in the right direction. Instructions on how to post pictures can be found HERE
Hi Graham, as Bruce said in your other post at torx T20 bit/screwdtiver will do it. They aren't that expensive, but having said all that a standard flat blade screwdriver works just as effectively as the screws are also slotted straight across.