Worcester has a higher population than England's Worcester, and as such probably has more backlinks to pages related to it. That is global. Expecting global results to be regionalized is silly; just use regionalized results.
That's a very engineer-focused way of looking at it.
I don't care about backlinks or population or whatever weighting DDG uses: I want relevant results. DDG is a user-facing search engine, not a tech demo. Showing a UK visitor three pages of results about Worcester, MA is simply bad UX.
Then use regional results! I, personally, am not an engineer. I'm a person who has an actual use for 'global' results, and my main reason for using DuckDuckGo is the ability to not have regional results.
If you want relevant results, don't use the global weighting. Use the UK weighting. That's why it's there. Literally so people with your preference of localized results can have localized results.
Now I set the region to the UK, I would expect the more relevant results. It shows the map for the US Worcester and mixed results again, but differently mixed:
I don't care about backlinks or population or whatever weighting DDG uses: I want relevant results. DDG is a user-facing search engine, not a tech demo. Showing a UK visitor three pages of results about Worcester, MA is simply bad UX.