The same GPS/TANS was operated in the Mk1 under Service Deviation.
My point was that the installed performance apparently differed because there was a warning to regard "Error" indications as "meaningless" in the Mk2, but no equivalent warning in the Mk1. But, the indication MUST mean something, which tends to confirm Boscombe's position that the aircraft's performance had not been established accurately enought to warrant a CA Release recommendaton - so they didn't give one.
MoD then lied about this, claiming Boscombe HAD recommended CAR. As ever, follow the lies, MoD's weaknesses are exposed and the truth emerges.