I haven't started this yet but am looking forward to it after reading Drxx's comment at @4 and figuring out the theme.
However, despite living in and around the requisite area all my life to date, I am a tad concerned about the source material.
in 30a for example, after working out the last three letters from 'French china' and then using the Chambers app to find the answer, I had to visit 4 online sites before finding verification for the first letter.
All this, of course, is predicated on me having the right theme:-)