In December 2007 he became North American Editor for BBC News, a role newly created in time for the American presidential election which began taking place in 2008. . He replaced Matt Frei who moved to present the new World News America bulletin. Webb was previously the BBC's chief Washington correspondent from 2001.
He raised eyebrows within the BBC in 2006 when, at a seminar on impartiality, he claimed the corporation was anti-American and treated the US with "scorn and derision", according it "no moral weight". He has also presented a Radio 4 series on anti-Americanism.
Webb joined the BBC as a graduate trainee in 1984 working in Northern Ireland for BBC Radio Ulster based in Belfast. He then worked as a reporter for BBC Radio 4's Today programme, before becoming a foreign affairs correspondent based in London and covering news around the world. He reported on the Gulf War and the war in Bosnia, the collapse of the Soviet Union and the first democratic elections in South Africa.
Before arriving in Washington he was a BBC News presenter based in London and the main presenter on BBC One's Breakfast News programme from 1992 to 1997. He also presented the BBC's One and Six O'Clock News bulletins and presented BBC Radio 4's The World Tonight from 1997-1998. From 1988 he spent three years working as the BBC's Europe correspondent based in Brussels. During that time he reported on the workings of the European Commission and Parliament, the politics surrounding Britain's decision on whether to join the single currency and the enlargement on the European Union.
Since November 2007, Webb has maintained a regularly-updated blog on the BBC website.