LONDON, June 9 : Tech firms in Britain will need to have plans to respond to surges in illegal content during crises such as the 2024 Southport riots which threaten public safety under strengthened rules set out by the regulator on Tuesday. Nationwide violence broke out two years ago following a knife attack in the northern England city of Southport, which left three young girls dead at a Taylor Swift-themed dance class. Authorities said inflammatory and misleading content circulating widely