Which English conductor worked for both the Halle Orchestra and Sergie Diaghilev's ballet company?
Colin Sauer:  He played with the Hallé Orchestra under John Barbirolli and the BBC Symphony Orchestra under Adrian Boult. Adrian Boult:  Brought up in a prosperous mercantile family, he followed musical studies in England and at Leipzig, Germany, with early conducting work in London for the Royal Opera House and Sergei Diaghilev's ballet company.
Adrian Boult