Given the growing influence of large language models such as ChatGPT, Claude, and Gemini on consumers' financial decisions, UK financial regulators are being urged to consider implementing oversight on these models. In an assessment report commissioned by the UK Financial Conduct Authority (FCA), FCA Executive Director Mills pointed out that financial institutions' reliance on a small number of technology suppliers could trigger system-wide risks. Currently, millions of UK citizens have started using AI technology to assist in personal financial decision-making, but these tools are often not protected by the existing financial regulatory framework. Mills suggested that the FCA should conduct a systemic assessment within the next three to six months, focusing on examining the scale, application methods, and potential impacts of AI models in financial services, and adjusting regulatory boundaries as appropriate. Additionally, the report warned that AI could amplify threats of fraud and cyberattacks, calling on the financial system to leverage the technology for reverse defense.