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Thanks Eddie M, I guess the screw with a cross in the head is Philips and the ones with a cross and 4 little indentations are Pozidrive. Whilst my screw bits are named PH or PZ, my screwdrivers are not, any easy way of identification?

I have power screw bits marked PH and PZ, whats the difference, and which one do I use for screwfix scrws which have a 'Prodrive' marking.