Okay, I sorted it out.
For the benefit of anyone else trying to do this, there is a small black metal panel that runs along the bottom of the front of the oven. Tilt the oven onto its side and there are two screws that hold the black panel to the bottom (underside) panel. Unscrew them and remove the black panel, then you can pull back the underside panel a bit and get your hand in to reach the door catch.
Hope this helps someone out there in Internet Land.
Daniel
Daniel
January 2007