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Apologies. I don’t have the Chambers Crossword Dictionary and was not aware it is a separate publication. All clear now.

Having lived in a certain region, two of the modifications were not too difficult, and it sounds as though several of us have the same SE corner. My only doubt is with the northern part, where I have two words but would have liked one. I've still followed the instructions, though.
By the way, there's nothing to say that entries have to be in a particular dictionary: they just have to be real words.

Hello cockie
‘In all the other clues,’ would eliminate ambiguity. As you say a rich and confusing language