After having an investigate of another car (and chatting with friendly local dealer) - it is slightly more variable! Not only do some cars have them on left side rather than right side (even dealer does not know why!), whether you can "self-fix" depends upon how the cables has been routed. Sometimes there is enough slack to pull gently (as in my case), but in others it is necessary to remove the headlining so as to reroute the cable to create enough slack.
I always thought the Japanese were rather good on quality control - all this variation in how they get built is a bit concening!
Andrew