Leftmost connector (with the red latch) is for the Passenger Airbag De-activation Warning Light; to make use of this
requires an additional ignition key operated switch to be fitted in the glovebox and the GEM to be programmed.
Middle connector (as you know) is for the heated rear screen.
Right connector is for the heated front screen (probably was an cost option fitment for a Style) if the wire colours are :-
- Black+White (3 off)