Looking forward to Rob's documentation of the RMS question.
Cunard did indeed make a very strong effort to remove QE2 from Cunard's past, even to the point of implying that the Queen Mary and Queen Elizabeth were "boring", as Rob mentioned, and thus Cunard's entire "Heritage".
Ironic that in recent years Cunard did a complete about-face on that very point, by turning to and relying on that boring past to sell QE2 and then QM2,and now QV and QE.
The press, probably by habit, from the very start reported on QE2 as "RMS", and as a result so did the public, up to the present day. A Google News archive search brings up example after example.
Looking through all of my early QE2 material, I cannot find a single reference to QE2 by Cunard as RMS, and I think the Potter & Frost book doesn't mention the RMS question at all.