Below is the total kit I used. As you can see, there aren't many tools required for this job at all, but it still is a real awkward DIY. It took me only 1 hour, but it has taken others up to 4 hours.

The part we are about to change is generally referred to by 3 different names;

• Heater Blower Resistor
• Final Stage Resistor (FSR)
• Final Stage Unit (FSU)

The FSR will be accessible form the drivers side (on Right Hand Drive cars).

First remove the 2 screws on the small glove compartment and pull the whole of it out.

Next pull out the ping of the expaning rivet and put the rivet out, then screw off with your hand the big round rubber buffer from under the pedals.

Next remove the the 3 remaining visible screws and pull the big trim panel down/out, once you have done this, disconnect the 4 wires:

• Pull out the 2 wires going to the green Warning Buzzer
• Pull out the connector going to the long black box
• Slide the grey plastic clip forward and pop out the black OBD port from the other side of the panel
  

With the motor out of the way, you will see right behind it a big bunch of wires going into a onnector, pull this out.

You will notice 2 holes for screws, but my car did not have any and if you don't either, then count yourself lucky as you don't have to remove them.

Now push the identified clip back and simply pull the Final Stage / Heater Blower Resistor out and replace it with the new one, ensuring you push the clip back into place.

At this point you can plug the connector back in and start the car to test the new Final Stage / Heater Blower Resistor. If the air flow is ok, then proceed to the next step.