ive from the Royal Albert Hall, Roger Norrington - who recently turned 70 - conducts the National Youth Orchestra of Great Britain in its annual visit to the Proms. This year's Prom has a Bohemian theme; they play three popular tone poems from Czech composer Smetana's patriotic work, Ma Vlast (My Country), followed by Mahler's Symphony No 1. During the interval, presenter Stephanie Hughes talks to Roger Norrington and members of the orchestra.