Where might plans for the Royal Navy's 1960s fast fleet oilers be found?
Short answerAfter the class is clarified, the recommended source is Brown and Moore's Rebuilding the Royal Navy.
NotesThe initial answer points to a volume containing Glen-class plans and tentatively suggests checking the 1930s Transactions of the Institution of Naval Architects. The question is later clarified as asking about the Royal Navy's 1960s fast fleet oilers. That clarification changes the recommendation to Brown and Moore's Rebuilding the Royal Navy. The exchange shows why the class and period have to be identified before a technical-source search can produce a useful lead.