I'm looking for the same part...in the mean time I have been able to get the small oven to work by swapping the solenoids betweent the large and small oven gas valves: the Main oven has an over-ride lever (front right when you take out the drawer) so you can use it in the event of a power failure, this is only a minor inconvenience.
You have to remove the side panel (two retaining screws inside the front pillar) and the blue plastic solenoid units can then be removed from the valves by undoing the two screws from each: You do not have to remove the valvesfrom the gas pipes but do be careful to replace the O ring seals between the valves and the solenoid plates.
You should by law have a Corgi registered fitter check your work.
David Craig, October 2009
