UK Prime Minister Keir Starmer has expressed his disappointment following the recent by-election results. According to Jin10, Starmer acknowledged the frustration of voters, stating that the outcome was far from what the party had hoped for. The by-election, which was seen as a critical test for the ruling party, did not yield favorable results, prompting Starmer to address the concerns of the electorate. The Prime Minister emphasized the importance of understanding and addressing the issues that led to voter dissatisfaction, as the party seeks to regain public trust and support in future elections.