just had a look,
Tilt seat all the way forward, now its time to get on the floor or have a feel, at the lowest part of the back piece you will find a plastic strip which runs the width of the seat, this is the connector / joiner, it will come apart. If you cant find it slide your fingers through the seat, ie the gap between the cushion which you sit on and the back piece, the connector is just above this gap on the back.
From memory it was a bit of a pig to get it back together, but that's the bit I undid which gave me full access to the inside of the seat.
I used a thin strong but flexible rod about 3 foot long, threaded it down the headrest hole, then on the top of the rod I tape a some string, pull the rod through the back of the seat, used the string then to pull the wire through
Sorted lol
Tried to take some photos but the sun is out and over exposing everything, will park up in the shade later on and take some