I'm a bit apprehensive about going to sleep now. There was a big bang and the power went off a minute ago. I lifted up the circuit breaker and 'bang!' off it goes again. Turns out it was coming from underneath the sink. I've unplugged the washing machine and dish washer. I'll have to check it out tomorrow. :/
I think I will give an update on this even though none of you really cared anyway. lol
I got an electrician out who said there was nothing wrong with the wiring. He reckons it is the dishwasher. Maybe some water has got on to the wiring inside. That is probably what has happened as I haven't had a problem since I unplugged it.