Chris

There are good reasons for keeping minor and new parties in the “other” column. It can distort the results of the poll and make it harder to track genuine change in voter sentiment. It’s unlikely Yougov was looking for controversy (depending on who actually commissioned it, they may have had some input into the way questions were asked also).

There were several early EU election polls that didn’t specify the Brexit party, and where they polled highly it was because respondents named them unprompted. With a very new party that’s probably a better guide as to how well they’re likely to do with the electorate at large. Recognition is important.