Various versions of the published libretto for Iolanthe.
Notable copies include:
- Copy interleaved as for prompt with handwritten corrections to the text. Labelled on front 'Corrected copy V / Mr Bull' in Helen Carte's hand, 1954.
- Bound copy marked as for an experiment suggested by Francis Toye in which the opera would be played in two acts, with corrections to text. 1954.
- Copy for the 1954 London revival. Labelled 'final copy', featuring corrections to text. Possibly the copy of Robert Gibson (director of productions for the Company, 1953-1956).