West was about to bid 2♠ over 2♣ but decided to ask about 2♣. "Both majors" he was told! So he passed.
After South bid 2NT North said she had realised she had misdescribed the 2♣ bid which was "Collins", showing both minors. The TD was called, failed to give East her last pass back, and the bidding proceeded.
While the defence missed its diamond ruff, declarer misguessed the diamonds so it went one off.
Now the TD was recalled: the defence suggested that the 2NT bid was affected by UI. The TD did not cover himself in glory by ruling at the table without consideration or consultation, but anyway, how would you rule?