How do you open the bonnet on a fiat punto elx 1.2 2001 as my bonnet cable has snapped

You should be able to get at it from under the vehicle if you have small enough arms and hands. The cable is at the top of the engine bay and connects to what looks like a curled piece of wire(which is the release catch). It is barely visible and diffycult to operate. Someone pressing down on the front centre of the hood (directly above the catch mechanism) will make things easier for the unfortunate individual that has to stick his head under the vehicle. It can be done without the need for tools. When you do get it open and need to replace the cable do not just pull the old cable out. It is a nightmare to replace without a draw wire. Fasten a piece of string or wire at least 2 meters(6-7 feet) to the old cable before removing it. Then remove the end of the string from the old cable and connect it to the new one before drawing the new cable into place using the draw wire. Some insulation tape over the end of the cable where it joins to the draw wire(to prevent it catching on something) will ease matters.