text:  A new British Prime Minister, Keir Starmer, took power today, hours after his centre-left Labour Party won a landslide election. NPR's Lauren Frayer reports from London on what changes Starmer plans to make. Under 14 years of UK Conservative Party rule, wait times in the National Health Service hit record highs. Plans for high-speed trains were scaled back, and budget cuts left public schools crumbling. In his first speech in 10 Downing Street, Prime Minister Keir Starmer pledged, We will rebuild Britain.