I got as far as this:

https://web2cit.toolforge.org/debug/https://www.gov.uk/government/publications/dress-codes-and-sex-discrimination-what-you-need-to-know

The debugging output says the itemType is correct, but when I try to actually use the gadget, it just gives me the fallback template.

It's not immediately clear to me how to proceed next so I figured I'd just file so you can tell me what I'm doing wrong :P.