2010 RRS 3.0l
diesel
RHD UK

I have been working hard to work out what the actual fault is regarding the interior heating.
I believe i can rule out the heater control valve as hot water is getting to the matrix.
Dial is set to hot
Cold air blowing on left hand side through all vents.
Hot air coming out of dash vent in middle yet only warm air blowing out on the window vent drivers side.

Rear heating:
Left side blowing cold
right hand blowing warm.

Matric has the two aluminium pipes in drivers foot well. Both pipes very hot.

What is the problem?
Core needs blasting out or door blend actuators?
thanks