IIRC, by the time layouts like this were being seen, thinking had moved away from trying to vector the full augmented blast of the engine - because of re-ingestion and erosion - and RR was working on neat folding exhausts that fitted between the turbine exit and the afterburner.
Time goes by, really ! Seeing these drawings from flight reminded me, that
about 15 years ago, I've used them (and a handful others, I think)
to make these drawings. In the meantime, it even is difficult to open those
old files ! Not to nowadays standard at all, nevertheless .... :