The FTSE 100 fell slightly on Monday after the UK benchmark notched its best week of the year, as renewed tariff uncertainty weighed on investor sentiment. Confusion returned after the Supreme Court struck down Donald Trump’s reciprocal tariff policy, leading him to announce 10% global tariffs before revising them to 15%, unsettling markets at the start of the week. Relx lost more than 2.5% and BAE Systems over 1%, while banks including Barclays, Lloyds Banking Group and NatWest fell 0.5% to 2.4%. On the upside, JD Sports jumped more than 4% on a GBP 200 million buyback plan. Precious metals supported miners, with Endeavour Mining and Fresnillo rising 6.5% and 3.2%, while Antofagasta, Anglo American and Glencore also gained.