Bosch classix washer/ dryer door won't open?

My washing machine wvf2402gb/02 has it's door locked closed. I have tried disconnecting it from power overnight, plus putting it through a couple of wash cycles. I've also tried to open the catch by using wire around the door etc (both directions!), and by trying to find a release inside the machine.

There doesn't seem to be an emergency release near the filter/ pump, so am totally out of ideas.

Is there anyone out there who could advise me what to try next? Am wondering if there is a separate fuse for the interlock somewhere, or if there is a part which tends to fail. Please help, thanks.

Zoe
May 2014