Can you hear the fuel pump coming on when you switch the igntition on?

If not it might be the inertia cut out switch.

If it's the fuel cut out inertia switch all you need to do is push it back in again. It's behind a plastic panel just in front of the drivers door (in the footwell) It's a black plastic thing with a red plunger on top and a couple of wires going to it, just push the red bit in until it clicks.

If the switch is knackered just link the wires so it's always 'on'.

Hope this helps, did for my mums car.

MazakMan