FTSE 100 today: UK shares finish flat as tariff and AI worries hit banks; Convatec jumps

London’s FTSE 100 finished just 4.15 points lower at 10,680.59 on Tuesday, barely budging, while the FTSE 250 slipped 45.61 points to 23,501.04. Convatec soared 10.4%; on the flip side, Unite Group dropped 14.3%. The day played out more as a test of individual names than any big-picture market shift.