Just call your local fabricator and tell them you want a frame for your size of door slab. You might have to fiddle about with how the lock keeps etc go in and it will be a bit of a ball ache.
Do you know the make?
There may be a stamp or sticker somewhere on the edge of the door or frame.
Any idea who fitted it? Might be worth checking you Fensa certificate to see who did the windows
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