Head office contacted me straight away after I emailed them. Replacement (free of charge) blades are on their way to me already.
Apparently if the machine is overloaded or you chop pieces of hard vegies which are too big, eventually over time the blades become stripped. "It generally happens from overloading your TM. Not necessarily at the time that it happens but at some time it has been overloaded. It is a really good thing to stick to the weights etc that are on your fridge magnet or the front of the EDC for that reason."