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Heart Breakfast with Jamie Theakston and Lucy Horobin 6:30am - 10am
27 April 2010, 08:46
The Mayor opens London's latest railway line later - a large stretch of the £1B extension to the East London Line.
It'll make life easier for thousands of Londoners and provide vital transport links for the Olympics.
When fully open next year it'll go from Highbury and Islington down to West Croydon.