this is a starter fault the clicking you here is the starter solenoid operating this then hits the contacts and provides the current to the starter to spin .
the problem with this is thatthe contacts wear down and can not make contact.
a replacement starter is required.
Thanks for your resposne which was very helpful, I have now made contact with a Mitsubishi dealer and he got their mechanic to look at my story and he responded with "thinking the most likely cause is a broken earth strap. This would cause the engine to stop and not restart but still leave the other electrics working, as they have a different earth. It seems to me to be the most obvious cause" Please advise if you tend to agree?
i have to disagree if the engines earth harness has broken you would not even hear a click from the solenoid as this and the starter share the same earth.