I have a mains circuit that behaves the way you describe - Fridge - Washing Machine - Tumble Dryer - Microwave - Boiler all buzzing away quite happily until we plug the iron in - then the fuse pops.
Add up the Wattage of each appliance - divide by the voltage - the result is the maximum current being drawn. Check it against the rating of the breaker.
You may have a circuit overload problem but you may also have an issue with your machine - how does it behave when it's on a lightly loaded circuit? What does temperamental mean? Sulky?
Good luck...
Igor
October 2014