i had to buy a new little circuit board that does this job.
THIS HAS A RELAY CONTACT ON IT THAT HOLDS THE SWITCH CONTACT IN. I had to hold mine with a piece of selotape until bought new board
Cant remember name of part but its about 6cm x 4cm.
Cost about £11
not easy to change
Have to remove the top
then the front panel timer Knob pulls off
Can be removed without removing whole of front panel if someone holds it away at the top or you wedge it away
Its screwed to tthe crossbar at the top next to the timer.
Hope this helps
nige proudlove, April 2008