If the door is shut, you can unplug it, take off the top, reach down inside to the locking point, and use a short-handled flat screwdriver to push the latch towards the right of the machine (as you look at the front) to release the door. Take the door off at the hinge (2 screws) take off the inner plate of the door and the handle is accessible. The trick is to get the spring re-loaded... The good news is it will all only go back together one way. I had to pay around £10 (including postage) to get a replacement from Indesit (product code MER058929).
dave k, October 2008