To make sure you make a proper fist of this, the police have developed the world's most useless mnemonic - 5 x W H & H - otherwise known as Who? What? Where? When? Why? and How? Next time you watch a real murder investigation on the TV, and you see a group of serious-looking detectives standing around talking, remember that what they're actually doing is trying to work out what sodding order the mnemonic is supposed to go in.