how do I refit door hing on Belling Farmhouse 910?

I have new hinges for the oven door on my belling farmhouse cooker - a simple job I thought to replace the existing ones. However, when you unscrew the hinges from the oven surround, the threaded 'panel' falls down, so it looks like there is no way to re-attach the door without taking the oven out! (what a crappy design!!).

Does anyone know how to get at these threaded parts or can tell me how to get the oven out?

from a frustrated husband