From what I can see, your categories are working as expected for amazon uk.
Regarding price check, they may not be accepting partner applications any more, so I'll have to make that option selectable as on/off.
I've also fixed the two offset notices on the product page. On that page, I've added an extra link for the main category, but a sub-category link is not easily and reliably achieved.
To be able to drill down through multiple sub-categories, I'll have to rewrite the code, so it's on my ToDo list.
Since there don't appear to be any more bugs, I guess it can now be released