I have the same problem too.
My Iron is 3 years old and this is the second fault.
I am a single person household so it is lucky if it sees 2 hours of work a month!
Unimpressed for a £400 iron.
When the switch broke I contacted customerservices(AT)solarzoneuk(DOT)co(DOT)uk who, because I did not have a proof of receipt charged me £70 for the repair and 'service' - both of which were only valid for 3 months.
I am trying to contact them again.
Under the Consumer Good act, we are entitled to "For up to six years after purchase (five years from discovery in Scotland) purchasers can demand damages (which a court would equate to the cost of a repair or replacement)." Given the cost of the iron it is not unreasonable to expect it to last longer than 3 years!
Failing that if anyone knows of a good Iron repair person please let me know!
JC
January 2011