David Hill (photo John Wood) If, like many organists, you are already leading a choir, but feel diffident about your conducting technique, then join an exceptional RCO choir training workshop coming up in November.  David Hill, one of the country's leading choral trainers, will be directing a day workshop on choral conducting on Saturday 2nd November, in St Mary Magdalene Church in Newark. David Hill began his musical career as an Organ Scholar at St John's College, Cambridge, returning to hold the post of Director of Music there.  He's been Master of the Music at Winchester…