Thankyou Nick. Your solution was indeed correct.
I have a feeling that the red button on the back of the machine is to reset a overheated element, simply because our machine failed to heat up after prolonged use.
This is most likely the failsafe device to prevent a destroyed element... or even fire.
I would also like to add that I was able to access the red button on the outside of the bulbous casing, rather than unscrewing the casing. A large circular red plastic button presses through the casing to the button inside.
Hope this works for others too, as its saved us from buying a new machine!
Luke G, September 2007