Hi John,
Re the place of issue, I put Liverpool on my previous application which was fine even though it doesn't state this on my passport. I will be doing the same again very soon. I know that Liverpool was always the Passport office to use for our area if you needed a passport urgently and you could apply in person. I don't know if this would be the case for Devon. The only other passport office I know of is in Durham city but, maybe there are others.
There's no harm in trying to ring the embassy for some guidance but, in my experience, they are not fussed about answering the phone.
Good luck mate.
Bill