This might sound a bit of a worry but here goes anyway. Im replacing UK electrical appliance plugs with European type - should be a straight forward job. However Im not sure where to attach the earth wire(on an earthed plug).The only option I can see is to twist the wire under the head of the flat screw in the middle and tighten it down. This does seem rather retrograde to me and I dont like things that go bang. Ive had no problem re-wiring when there isnt an earth wire so Im not completely out of my depth.