journalist jonathan maitland is confident the public is prepared for drama .
an audience with jimmy savile to open in june starring alistair mcgowan .
the actor is best known for his comedic impressions of celebrities .
previously portrayed savile in his popular bbc series the big impression .
lawyer acting on behalf of savile 's victims said they were happy with play .
but some critics condemned subject choice as ` not right ' and ` unbelievable '