LONDON—UK border officers have been directed to stop routinely checking whether travelers from many countries have tested negative for COVID-19, British media reported Wednesday, citing leaked government documents. While the change is designed to reduce waiting times for airport immigration checks, it has raised concerns about importing new coronavirus cases at a time when infection rates in Britain are soaring, the Guardian newspaper reported. The new policy applies to people arriving from so-called green and amber list countries, the top two levels of the government’s three-tier traffic light system for foreign travel. Everyone entering Britain is still legally required to fill out a passenger locator form and have a negative COVID-19 test even if border officials don’t routinely check their documentation. The changes come after the government relaxed quarantine rules for amber-list countries, including most of Europe, triggering warnings that holiday travelers might face hours-long lines for airport immigration checks. …