@andyjh said:why the clarinet is the only instrument left without any vibrato, it always stops me using the clarinet for expressive solo's
That is a strange statement. The clarinet is not expressive without vibrato? That would be news for Ravel, Debussy, Mahler, Tchaikovsky, a few thousand others.
Closer to the film music world, try listening to Bernard Herrmann's Souvenir de Voyage. That is not expressive clarinet? Adding vibrato to that beautiful sound would be obscene.