Have to agree with Killucan - I certainly saw most of the class all over the place in those days and I never saw a supertrain-liveried loco with the "set of points" logo but no "tippex" white lines. They seemed to all have been repainted properly.
One 141 at least sported "sets of points" on the sides, while still carrying a "broken wheel" on each end!!! See page 43, "Rails Through the West", loco 155, caught on film by Barry Carse in 1990.
I stand to be corrected on this one, but I would be reasonably sure that no 121 carried the new logo without white stripes - I certainly don't remember seeing it. Seemed to be a disease caught only by classes A, 141 & 181!