With only HMS Victorious in the Home Fleet, HMS Formidable in the Mediterranean Fleet and Illustrious in the Eastern Fleet — the RN did not have carriers to spare.

Please see my answer to this question originally asked and answered on Quora below.

With only HMS Victorious in the Home Fleet, HMS Formidable in the Mediterranean Fleet and Illustrious in the Eastern Fleet — the RN did not have carriers to spare.