Plot: Introduced by Richard Baker BBC1 joins Radios 2 and 3 in stereo for the rousing festivities of the second half of tonight's Prom, the climax of the 87th season of Henry Wood Promenade Concerts, live from the Royal Albert Hall. James Loughran conducts the BBC Symphony Orchestra leader BELA DEKANY with the Halle Choir Elgar March: Pomp and Circumstance No 1, in D major Malcolm Arnold Orchestral Dances Henry Wood Fantasia on British Sea Songs Parry, orch Elgar Jerusalem