Were Courageous and Glorious the only carrier conversions considered by the Royal Navy?
Short answerProbably not; circumstantial archival evidence suggests Admiral-class conversions were also examined, but no definitive proof has been found.
NotesNo surviving document cited in the lecture definitively orders an Admiral-class carrier conversion. The clue comes from later internal correspondence describing yards associated with the Admiral project as especially knowledgeable about large carriers. Those yards had not completed a carrier, so the statement implies design work not visible in the surviving record. The proposed link is a reasoned archival hypothesis rather than proof.