French language Q&A Forum

I am searching for some pattern in the placement of an adjective when it modifies a noun also modified by a prepositional phrase.  Our paragraph has two examples where the adjective, traditional, modifies such a noun.  The first concerns "dinde rôtie aux marrons".  There were a number of possibilities given for the position of traditionnelle including directly in front of dinde.  The second usage is in the last sentence where traditionel modifies plats de Noël.   Following the example from the first usage, I placed traditionnels in front of plats thinking that plats de Noël should be kept together.  This was marked as incorrect and I see that traditionnels is placed in the customary position after the noun and in front of de Noël.   Is there rule that one can apply to the placement of adjectives when they modify a noun also modified by some sort of prepositional phrase such as plats de Noël or dinde rôtie aux marrons ? 

England doesn't have provinces! The way England is subdivided is frankly horrendously complex, however, it suffices to say that the examples given are of counties.

The word province, when it doesn't just cause confusion, is more likely to mean the "regions" because some of the original post-WW2 proposals for an official top level subdivision of England used this term.

can we use the verbs which can be inverted with je in the future ?

For example          devrai-je?(is this  correct?)