British parents who don’t know what their kids are downloading on the family computer may want to start paying more attention, thanks to a new antipiracy agreement among the six largest Internet service providers in the United Kingdom. The U.S. music industry will no doubt track developments in the UK. That’s because the effort, announced by BT, Virgin Media, BSkyB, Orange, Carphone Warehouse and Tiscali, will start with warning letters to suspected illegal downloaders but could eventually include penalties like online monitoring and reduced Internet speeds to households.